# Kernal Issue (Died) **URL:** \ **Category:** Bug Reports\ **Created:** [October 13, 2025, 3:44pm UTC](https://forum.cursor.com/t/kernal-issue-died/137238 "2025-10-13T15:44:01Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![David\_Draper](https://avatars.discourse-cdn.com/v4/letter/d/e95f7d/32.png) [@David\_Draper](https://forum.cursor.com/u/David_Draper)\ **Post date:** [October 13, 2025, 3:44pm UTC](https://forum.cursor.com/t/kernal-issue-died/137238/1 "2025-10-13T15:44:01Z")
### Describe the Bug Getting the following issue any ideas on how ot resolve? `Cursor (1.99.3, undefined, desktop) Jupyter Extension Version: 2025.3.0. Python Extension Version: 2025.6.1. Pylance Extension Version (Not Used) : 2024.8.1. Platform: darwin (arm64). Home = /Users/daviddraper Temp Storage folder ~/Library/Application Support/Cursor/User/globalStorage/ms-toolsai.jupyter/version-2025.3.0 Workspace folder ~/Infinigate/inf-aida-internal-ariba 13:20:35.716 [info] Deleting old temp dir /Users/~/Library/Application Support/Cursor/User/globalStorage/ms-toolsai.jupyter/version-2025.2.0 13:20:35.984 [info] Starting Kernel (Python Path: ~/anaconda3/envs/infinigategenai/bin/python, Conda, 3.11.13) for '~/Infinigate/inf-aida-internal-ariba/src/agent.ipynb' (disableUI=true) 13:20:35.996 [error] Failure in registering port attributes [Error: Extension 'ms-toolsai.jupyter' CANNOT use API proposal: portsAttributes. Its package.json#enabledApiProposals-property declares: notebookDeprecated, notebookMessaging, notebookMime, notebookCellExecutionState, quickPickSortByLabel, notebookKernelSource, interactiveWindow, notebookControllerAffinityHidden, contribNotebookStaticPreloads, quickPickItemTooltip, notebookExecution, notebookCellExecution, notebookVariableProvider, notebookReplDocument but NOT portsAttributes. The missing proposal MUST be added and you must start in extension development mode or use the following command line switch: --enable-proposed-api ms-toolsai.jupyter. Note that the cursor and control proposals are only available for built-in extensions at B (file:///Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/api/node/extensionHostProcess.js:129:20165) at Object.registerPortAttributesProvider (file:///Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/api/node/extensionHostProcess.js:198:158663) at HD (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/extension.node.js:279:2688) at Us.launch (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/extension.node.js:300:7467) at process.processTicksAndRejections (node:internal/process/task_queues:95:5) at async oT.start (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/extension.node.js:301:11153) at async sT.startKernel (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/extension.node.js:301:21741) at async jy.create (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/extension.node.js:301:24048) at async w_.createJupyterSession (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/extension.node.js:282:37175) at async w_.startJupyterSession (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/extension.node.js:282:34827) at async w_.start (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/extension.node.js:282:30873) at async n.wrapKernelMethodImpl (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/extension.node.js:301:84144)] 13:20:37.579 [info] Process Execution: ~/anaconda3/envs/infinigategenai/bin/python -m pip list 13:20:37.580 [info] Process Execution: ~/anaconda3/envs/infinigategenai/bin/python -c "import ipykernel; print(ipykernel. __version__ ); print("5dc3a68c-e34e-4080-9c3e-2a532b2ccb4d"); print(ipykernel. __file__ )" 13:20:37.580 [info] Process Execution: ~/anaconda3/envs/infinigategenai/bin/python -m ipykernel_launcher --f=/Users/~/Library/Jupyter/runtime/kernel-v36184952c45a7899c275fa618b845a8b85d4c16bd.json > cwd: ~/Infinigate/inf-aida-internal-ariba/src 13:21:38.638 [error] Failed to request kernel info [Canceled: Canceled at $se.value (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/extension.node.js:181:25631) at J._deliver (file:///Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/api/node/extensionHostProcess.js:29:2961) at J.fire (file:///Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/api/node/extensionHostProcess.js:29:3282) at Wse.cancel (file:///Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/api/node/extensionHostProcess.js:29:6177) at Tt.cancel (file:///Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/api/node/extensionHostProcess.js:29:6718) at Timeout._onTimeout (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/extension.node.js:301:11862) at listOnTimeout (node:internal/timers:581:17) at process.processTimers (node:internal/timers:519:7)] 13:21:38.643 [warn] Failed to shutdown kernel, .jvsc74a57bd0e74adc3b782dc4fda8aa50c4aebc69c5d71591a427288d2b513105ac410e7047./Users/~/anaconda3/envs/infinigategenai/python./Users/~/anaconda3/envs/infinigategenai/python.-m#ipykernel_launcher [TypeError: Failed to parse URL from /api/kernels/80fec8cb-0e68-46f3-ab5f-e4a615918163?1760358098642 at new Request (node:internal/deps/undici/undici:9588:19) at Object.t [as handleRequest] (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/node_modules/@jupyterlab/services/lib/kernel/default/index.js:11:2049) at Object.t [as makeRequest] (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/node_modules/@jupyterlab/services/lib/kernel/default/index.js:11:490) at Object.kf [as shutdownKernel] (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/node_modules/@jupyterlab/services/lib/kernel/default/index.js:11:44320) at n.shutdown (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/node_modules/@jupyterlab/services/lib/kernel/default/index.js:17:53511) at oT.start (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/extension.node.js:301:12449) at async sT.startKernel (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/extension.node.js:301:21741) at async jy.create (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/extension.node.js:301:24048) at async w_.createJupyterSession (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/extension.node.js:282:37175) at async w_.startJupyterSession (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/extension.node.js:282:34827) at async w_.start (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/extension.node.js:282:30873) at async n.wrapKernelMethodImpl (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/extension.node.js:301:84144)] { [cause]: [TypeError: Invalid URL at new URL (node:internal/url:806:29) at new Request (node:internal/deps/undici/undici:9586:25) at Object.t [as handleRequest] (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/node_modules/@jupyterlab/services/lib/kernel/default/index.js:11:2049) at Object.t [as makeRequest] (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/node_modules/@jupyterlab/services/lib/kernel/default/index.js:11:490) at Object.kf [as shutdownKernel] (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/node_modules/@jupyterlab/services/lib/kernel/default/index.js:11:44320) at n.shutdown (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/node_modules/@jupyterlab/services/lib/kernel/default/index.js:17:53511) at oT.start (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/extension.node.js:301:12449) at async sT.startKernel (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/extension.node.js:301:21741) at async jy.create (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/extension.node.js:301:24048) at async w_.createJupyterSession (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/extension.node.js:282:37175) at async w_.startJupyterSession (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/extension.node.js:282:34827) at async w_.start (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/extension.node.js:282:30873) at async n.wrapKernelMethodImpl (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/extension.node.js:301:84144)] { code: 'ERR_INVALID_URL', input: '/api/kernels/80fec8cb-0e68-46f3-ab5f-e4a615918163?1760358098642' } } 13:21:38.669 [error] Disposing session as kernel process died ExitCode: undefined, Reason: undefined 13:21:38.672 [error] Failed to connect raw kernel session: Error: The kernel died. Error: ... View Jupyter [log](command:jupyter.viewOutput) for further details. 13:21:38.673 [warn] Error occurred while trying to start the kernel, options.disableUI=true Error: The kernel died. Error: ... View Jupyter [log](command:jupyter.viewOutput) for further details. > Kernel Id = .jvsc74a57bd0e74adc3b782dc4fda8aa50c4aebc69c5d71591a427288d2b513105ac410e7047./Users/~/anaconda3/envs/infinigategenai/python./Users/~/anaconda3/envs/infinigategenai/python.-m#ipykernel_launcher > Interpreter Id = ~/anaconda3/envs/infinigategenai/bin/python > at oT. (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/extension.node.js:301:11757) > stdErr = 16:35:13.306 [info] Starting Kernel (Python Path: ~/anaconda3/envs/infinigategenai/bin/python, Conda, 3.11.13) for '~/Infinigate/inf-aida-internal-ariba/src/agent.ipynb' (disableUI=false) 16:35:13.315 [error] Failure in registering port attributes [Error: Extension 'ms-toolsai.jupyter' CANNOT use API proposal: portsAttributes. Its package.json#enabledApiProposals-property declares: notebookDeprecated, notebookMessaging, notebookMime, notebookCellExecutionState, quickPickSortByLabel, notebookKernelSource, interactiveWindow, notebookControllerAffinityHidden, contribNotebookStaticPreloads, quickPickItemTooltip, notebookExecution, notebookCellExecution, notebookVariableProvider, notebookReplDocument but NOT portsAttributes. The missing proposal MUST be added and you must start in extension development mode or use the following command line switch: --enable-proposed-api ms-toolsai.jupyter. Note that the cursor and control proposals are only available for built-in extensions at B (file:///Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/api/node/extensionHostProcess.js:129:20165) at Object.registerPortAttributesProvider (file:///Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/api/node/extensionHostProcess.js:198:158663) at HD (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/extension.node.js:279:2688) at Us.launch (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/extension.node.js:300:7467) at process.processTicksAndRejections (node:internal/process/task_queues:95:5) at async oT.start (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/extension.node.js:301:11153) at async sT.startKernel (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/extension.node.js:301:21741) at async jy.create (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/extension.node.js:301:24048) at async w_.createJupyterSession (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/extension.node.js:282:37175) at async w_.startJupyterSession (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/extension.node.js:282:34827) at async w_.start (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/extension.node.js:282:30873) at async n.wrapKernelMethodImpl (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/extension.node.js:301:84144)] 16:35:13.841 [info] Process Execution: ~/anaconda3/envs/infinigategenai/bin/python -c "import ipykernel; print(ipykernel. __version__ ); print("5dc3a68c-e34e-4080-9c3e-2a532b2ccb4d"); print(ipykernel. __file__ )" 16:35:13.841 [info] Process Execution: ~/anaconda3/envs/infinigategenai/bin/python -m ipykernel_launcher --f=/Users/~/Library/Jupyter/runtime/kernel-v37f66019793cfbc1565e38df120210e53042cc265.json > cwd: ~/Infinigate/inf-aida-internal-ariba/src 16:36:14.462 [error] Failed to request kernel info [Canceled: Canceled at $se.value (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/extension.node.js:181:25631) at J._deliver (file:///Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/api/node/extensionHostProcess.js:29:2961) at J.fire (file:///Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/api/node/extensionHostProcess.js:29:3282) at Wse.cancel (file:///Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/api/node/extensionHostProcess.js:29:6177) at Tt.cancel (file:///Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/api/node/extensionHostProcess.js:29:6718) at Timeout._onTimeout (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/extension.node.js:301:11862) at listOnTimeout (node:internal/timers:581:17) at process.processTimers (node:internal/timers:519:7)] 16:36:14.474 [warn] Failed to shutdown kernel, .jvsc74a57bd0e74adc3b782dc4fda8aa50c4aebc69c5d71591a427288d2b513105ac410e7047./Users/~/anaconda3/envs/infinigategenai/python./Users/~/anaconda3/envs/infinigategenai/python.-m#ipykernel_launcher [TypeError: Failed to parse URL from /api/kernels/1b8032c8-778f-41af-95f9-8a3d8efc60df?1760369774473 at new Request (node:internal/deps/undici/undici:9588:19) at Object.t [as handleRequest] (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/node_modules/@jupyterlab/services/lib/kernel/default/index.js:11:2049) at Object.t [as makeRequest] (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/node_modules/@jupyterlab/services/lib/kernel/default/index.js:11:490) at Object.kf [as shutdownKernel] (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/node_modules/@jupyterlab/services/lib/kernel/default/index.js:11:44320) at n.shutdown (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/node_modules/@jupyterlab/services/lib/kernel/default/index.js:17:53511) at oT.start (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/extension.node.js:301:12449) at async sT.startKernel (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/extension.node.js:301:21741) at async jy.create (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/extension.node.js:301:24048) at async w_.createJupyterSession (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/extension.node.js:282:37175) at async w_.startJupyterSession (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/extension.node.js:282:34827) at async w_.start (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/extension.node.js:282:30873) at async n.wrapKernelMethodImpl (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/extension.node.js:301:84144)] { [cause]: [TypeError: Invalid URL at new URL (node:internal/url:806:29) at new Request (node:internal/deps/undici/undici:9586:25) at Object.t [as handleRequest] (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/node_modules/@jupyterlab/services/lib/kernel/default/index.js:11:2049) at Object.t [as makeRequest] (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/node_modules/@jupyterlab/services/lib/kernel/default/index.js:11:490) at Object.kf [as shutdownKernel] (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/node_modules/@jupyterlab/services/lib/kernel/default/index.js:11:44320) at n.shutdown (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/node_modules/@jupyterlab/services/lib/kernel/default/index.js:17:53511) at oT.start (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/extension.node.js:301:12449) at async sT.startKernel (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/extension.node.js:301:21741) at async jy.create (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/extension.node.js:301:24048) at async w_.createJupyterSession (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/extension.node.js:282:37175) at async w_.startJupyterSession (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/extension.node.js:282:34827) at async w_.start (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/extension.node.js:282:30873) at async n.wrapKernelMethodImpl (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/extension.node.js:301:84144)] { code: 'ERR_INVALID_URL', input: '/api/kernels/1b8032c8-778f-41af-95f9-8a3d8efc60df?1760369774473' } } 16:36:14.504 [error] Disposing session as kernel process died ExitCode: undefined, Reason: undefined 16:36:14.509 [error] Failed to connect raw kernel session: Error: The kernel died. Error: ... View Jupyter [log](command:jupyter.viewOutput) for further details. 16:36:14.510 [warn] Error occurred while trying to start the kernel, options.disableUI=false Error: The kernel died. Error: ... View Jupyter [log](command:jupyter.viewOutput) for further details. > Kernel Id = .jvsc74a57bd0e74adc3b782dc4fda8aa50c4aebc69c5d71591a427288d2b513105ac410e7047./Users/~/anaconda3/envs/infinigategenai/python./Users/~/anaconda3/envs/infinigategenai/python.-m#ipykernel_launcher > Interpreter Id = ~/anaconda3/envs/infinigategenai/bin/python > at oT. (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/extension.node.js:301:11757) > stdErr = 16:36:14.511 [warn] Kernel Error, context = start Error: The kernel died. Error: ... View Jupyter [log](command:jupyter.viewOutput) for further details. > Kernel Id = .jvsc74a57bd0e74adc3b782dc4fda8aa50c4aebc69c5d71591a427288d2b513105ac410e7047./Users/~/anaconda3/envs/infinigategenai/python./Users/~/anaconda3/envs/infinigategenai/python.-m#ipykernel_launcher > Interpreter Id = ~/anaconda3/envs/infinigategenai/bin/python > at oT. (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/extension.node.js:301:11757) > stdErr = 16:36:14.515 [info] Process Execution: ~/anaconda3/envs/infinigategenai/bin/python -c "import ipykernel;print('6af208d0-cb9c-427f-b937-ff563e17efdf')" 16:36:14.670 [info] Dispose Kernel '~/Infinigate/inf-aida-internal-ariba/src/agent.ipynb' associated with '~/Infinigate/inf-aida-internal-ariba/src/agent.ipynb' 16:36:14.672 [error] Error in notebook cell execution Error: The kernel died. Error: ... View Jupyter [log](command:jupyter.viewOutput) for further details. > Kernel Id = .jvsc74a57bd0e74adc3b782dc4fda8aa50c4aebc69c5d71591a427288d2b513105ac410e7047./Users/~/anaconda3/envs/infinigategenai/python./Users/~/anaconda3/envs/infinigategenai/python.-m#ipykernel_launcher > Interpreter Id = ~/anaconda3/envs/infinigategenai/bin/python > at oT. (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/extension.node.js:301:11757) > stdErr = 16:36:14.672 [error] Error in execution (get message for cell) Error: The kernel died. Error: ... View Jupyter [log](command:jupyter.viewOutput) for further details. > Kernel Id = .jvsc74a57bd0e74adc3b782dc4fda8aa50c4aebc69c5d71591a427288d2b513105ac410e7047./Users/~/anaconda3/envs/infinigategenai/python./Users/~/anaconda3/envs/infinigategenai/python.-m#ipykernel_launcher > Interpreter Id = ~/anaconda3/envs/infinigategenai/bin/python > at oT. (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2025.3.0-universal/dist/extension.node.js:301:11757) > stdErr = 16:36:14.673 [info] Process Execution: ~/anaconda3/envs/infinigategenai/bin/python -c "import ipykernel;print('6af208d0-cb9c-427f-b937-ff563e17efdf')"` ### Steps to Reproduce Running a ipynb file ### Operating System MacOS ### Current Cursor Version (Menu → About Cursor → Copy) Version: 1.7.44 VSCode Version: 1.99.3 Commit: 9d178a4■■■89981b62546448bb32920a8219a5d0 Date: 2025-10-10T15:43:37.500Z (2 days ago) Electron: 34.5.8 Chromium: 132.0.6834.210 Node.js: 20.19.1 V8: 13.2.152.41-electron.0 OS: Darwin arm64 24.6.0 ### Does this stop you from using Cursor Yes - Cursor is unusable ---
**Author:** ![deanrie](https://sea3.discourse-cdn.com/cursor1/user_avatar/forum.cursor.com/deanrie/32/1263_2.png) [@deanrie](https://forum.cursor.com/u/deanrie)\ **Post date:** [October 13, 2025, 4:29pm UTC](https://forum.cursor.com/t/kernal-issue-died/137238/2 "2025-10-13T16:29:53Z")
Hey, thanks for the report. Based on the errors, the Jupyter extension (2025.3.0) is trying to use the `portsAttributes` API, which isn’t available in your version of Cursor, causing the kernel to crash. Please try: 1. Downgrade Jupyter to an earlier version: 2. Update `ipykernel` in your conda environment: `conda activate infinigategenai` `pip install --upgrade ipykernel` 3. Reload window Cursor Let me know if downgrading the extension helps. ---
**Author:** ![David\_Draper](https://avatars.discourse-cdn.com/v4/letter/d/e95f7d/32.png) [@David\_Draper](https://forum.cursor.com/u/David_Draper)\ **Post date:** [October 13, 2025, 5:43pm UTC](https://forum.cursor.com/t/kernal-issue-died/137238/3 "2025-10-13T17:43:11Z")
This didn’t seem to work either - never had this issue before: ```auto Cursor (1.99.3, undefined, desktop) Jupyter Extension Version: 2024.9.1. Python Extension Version: 2025.6.1. Pylance Extension Version (Not Used) : 2024.8.1. Platform: darwin (arm64). Temp Storage folder ~/Library/Application Support/Cursor/User/globalStorage/ms-toolsai.jupyter/version-2024.9.1 Workspace folder ~/Infinigate/inf-aida-internal-ariba, Home = /Users/daviddraper 18:40:23.294 [info] Starting Kernel (Python Path: ~/anaconda3/envs/infinigategenai/bin/python, Conda, 3.11.13) for '~/Infinigate/inf-aida-internal-ariba/src/agent.ipynb' (disableUI=true) 18:40:23.328 [error] Failure in registering port attributes [Error: Extension 'ms-toolsai.jupyter' CANNOT use API proposal: portsAttributes. Its package.json#enabledApiProposals-property declares: notebookDeprecated, notebookMessaging, notebookMime, notebookCellExecutionState, quickPickSortByLabel, notebookKernelSource, interactiveWindow, notebookControllerAffinityHidden, contribNotebookStaticPreloads, quickPickItemTooltip, notebookExecution, notebookCellExecution, notebookVariableProvider, notebookReplDocument but NOT portsAttributes. The missing proposal MUST be added and you must start in extension development mode or use the following command line switch: --enable-proposed-api ms-toolsai.jupyter. Note that the cursor and control proposals are only available for built-in extensions at B (file:///Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/api/node/extensionHostProcess.js:129:20165) at Object.registerPortAttributesProvider (file:///Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/api/node/extensionHostProcess.js:198:158663) at kD (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2024.9.1-universal/dist/extension.node.js:282:2688) at Us.launch (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2024.9.1-universal/dist/extension.node.js:303:7174) at process.processTicksAndRejections (node:internal/process/task_queues:95:5) at async L_.start (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2024.9.1-universal/dist/extension.node.js:304:11037) at async U_.startKernel (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2024.9.1-universal/dist/extension.node.js:304:21270) at async Ay.create (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2024.9.1-universal/dist/extension.node.js:304:23577) at async n_.createJupyterSession (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2024.9.1-universal/dist/extension.node.js:285:35993) at async n_.startJupyterSession (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2024.9.1-universal/dist/extension.node.js:285:34001) at async n.wrapKernelMethodImpl (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2024.9.1-universal/dist/extension.node.js:304:82604)] 18:40:34.318 [info] Process Execution: ~/anaconda3/envs/infinigategenai/bin/python -c "import ipykernel; print(ipykernel. __version__ ); print("5dc3a68c-e34e-4080-9c3e-2a532b2ccb4d"); print(ipykernel. __file__ )" 18:40:34.319 [info] Process Execution: ~/anaconda3/envs/infinigategenai/bin/python -m ipykernel_launcher --f=/Users/~/Library/Jupyter/runtime/kernel-v3d2c68b54c4f5cce96baf405b1c65dd6a1fec02e0.json > cwd: //Users/~/Infinigate/inf-aida-internal-ariba/src 18:40:34.324 [info] Process Execution: ~/anaconda3/envs/infinigategenai/bin/python -m pip list 18:41:36.001 [error] Failed to request kernel info [Canceled: Canceled at $se.value (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2024.9.1-universal/dist/extension.node.js:181:24587) at J._deliver (file:///Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/api/node/extensionHostProcess.js:29:2961) at J.fire (file:///Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/api/node/extensionHostProcess.js:29:3282) at Wse.cancel (file:///Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/api/node/extensionHostProcess.js:29:6177) at Tt.cancel (file:///Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/api/node/extensionHostProcess.js:29:6718) at Timeout._onTimeout (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2024.9.1-universal/dist/extension.node.js:304:11746) at listOnTimeout (node:internal/timers:581:17) at process.processTimers (node:internal/timers:519:7)] 18:41:36.015 [warn] Failed to shutdown kernel, .jvsc74a57bd0e74adc3b782dc4fda8aa50c4aebc69c5d71591a427288d2b513105ac410e7047./Users/~/anaconda3/envs/infinigategenai/python./Users/~/anaconda3/envs/infinigategenai/python.-m#ipykernel_launcher [TypeError: Failed to parse URL from /api/kernels/d960521f-4aae-4af3-9afd-d53998e6c276?1760377296015 at new Request (node:internal/deps/undici/undici:9588:19) at Object.t [as handleRequest] (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2024.9.1-universal/dist/node_modules/@jupyterlab/services/lib/kernel/nonSerializingKernel.js:11:2054) at Object.t [as makeRequest] (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2024.9.1-universal/dist/node_modules/@jupyterlab/services/lib/kernel/nonSerializingKernel.js:11:730) at Object.Vl [as shutdownKernel] (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2024.9.1-universal/dist/node_modules/@jupyterlab/services/lib/kernel/nonSerializingKernel.js:11:5781) at n.shutdown (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2024.9.1-universal/dist/node_modules/@jupyterlab/services/lib/kernel/nonSerializingKernel.js:11:89571) at L_.start (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2024.9.1-universal/dist/extension.node.js:304:12333) at async U_.startKernel (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2024.9.1-universal/dist/extension.node.js:304:21270) at async Ay.create (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2024.9.1-universal/dist/extension.node.js:304:23577) at async n_.createJupyterSession (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2024.9.1-universal/dist/extension.node.js:285:35993) at async n_.startJupyterSession (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2024.9.1-universal/dist/extension.node.js:285:34001) at async n.wrapKernelMethodImpl (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2024.9.1-universal/dist/extension.node.js:304:82604)] { [cause]: [TypeError: Invalid URL at new URL (node:internal/url:806:29) at new Request (node:internal/deps/undici/undici:9586:25) at Object.t [as handleRequest] (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2024.9.1-universal/dist/node_modules/@jupyterlab/services/lib/kernel/nonSerializingKernel.js:11:2054) at Object.t [as makeRequest] (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2024.9.1-universal/dist/node_modules/@jupyterlab/services/lib/kernel/nonSerializingKernel.js:11:730) at Object.Vl [as shutdownKernel] (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2024.9.1-universal/dist/node_modules/@jupyterlab/services/lib/kernel/nonSerializingKernel.js:11:5781) at n.shutdown (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2024.9.1-universal/dist/node_modules/@jupyterlab/services/lib/kernel/nonSerializingKernel.js:11:89571) at L_.start (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2024.9.1-universal/dist/extension.node.js:304:12333) at async U_.startKernel (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2024.9.1-universal/dist/extension.node.js:304:21270) at async Ay.create (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2024.9.1-universal/dist/extension.node.js:304:23577) at async n_.createJupyterSession (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2024.9.1-universal/dist/extension.node.js:285:35993) at async n_.startJupyterSession (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2024.9.1-universal/dist/extension.node.js:285:34001) at async n.wrapKernelMethodImpl (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2024.9.1-universal/dist/extension.node.js:304:82604)] { code: 'ERR_INVALID_URL', input: '/api/kernels/d960521f-4aae-4af3-9afd-d53998e6c276?1760377296015' } } 18:41:36.041 [error] Disposing session as kernel process died ExitCode: undefined, Reason: undefined 18:41:36.048 [error] Failed to connect raw kernel session: Error: The kernel died. Error: ... View Jupyter [log](command:jupyter.viewOutput) for further details. 18:41:36.050 [warn] Error occurred while trying to start the kernel, options.disableUI=false Error: The kernel died. Error: ... View Jupyter [log](command:jupyter.viewOutput) for further details. > Kernel Id = .jvsc74a57bd0e74adc3b782dc4fda8aa50c4aebc69c5d71591a427288d2b513105ac410e7047./Users/~/anaconda3/envs/infinigategenai/python./Users/~/anaconda3/envs/infinigategenai/python.-m#ipykernel_launcher > Interpreter Id = ~/anaconda3/envs/infinigategenai/bin/python > at L_. (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2024.9.1-universal/dist/extension.node.js:304:11641) > stdErr = 18:41:36.050 [warn] Kernel Error, context = start Error: The kernel died. Error: ... View Jupyter [log](command:jupyter.viewOutput) for further details. > Kernel Id = .jvsc74a57bd0e74adc3b782dc4fda8aa50c4aebc69c5d71591a427288d2b513105ac410e7047./Users/~/anaconda3/envs/infinigategenai/python./Users/~/anaconda3/envs/infinigategenai/python.-m#ipykernel_launcher > Interpreter Id = ~/anaconda3/envs/infinigategenai/bin/python > at L_. (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2024.9.1-universal/dist/extension.node.js:304:11641) > stdErr = 18:41:36.053 [info] Process Execution: ~/anaconda3/envs/infinigategenai/bin/python -c "import ipykernel;print('6af208d0-cb9c-427f-b937-ff563e17efdf')" 18:41:36.350 [info] Dispose Kernel '~/Infinigate/inf-aida-internal-ariba/src/agent.ipynb' associated with '~/Infinigate/inf-aida-internal-ariba/src/agent.ipynb' 18:41:36.351 [error] Error in notebook cell execution Error: The kernel died. Error: ... View Jupyter [log](command:jupyter.viewOutput) for further details. > Kernel Id = .jvsc74a57bd0e74adc3b782dc4fda8aa50c4aebc69c5d71591a427288d2b513105ac410e7047./Users/~/anaconda3/envs/infinigategenai/python./Users/~/anaconda3/envs/infinigategenai/python.-m#ipykernel_launcher > Interpreter Id = ~/anaconda3/envs/infinigategenai/bin/python > at L_. (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2024.9.1-universal/dist/extension.node.js:304:11641) > stdErr = 18:41:36.352 [error] Error in execution (get message for cell) Error: The kernel died. Error: ... View Jupyter [log](command:jupyter.viewOutput) for further details. > Kernel Id = .jvsc74a57bd0e74adc3b782dc4fda8aa50c4aebc69c5d71591a427288d2b513105ac410e7047./Users/~/anaconda3/envs/infinigategenai/python./Users/~/anaconda3/envs/infinigategenai/python.-m#ipykernel_launcher > Interpreter Id = ~/anaconda3/envs/infinigategenai/bin/python > at L_. (/Users/~/.cursor/extensions/ms-toolsai.jupyter-2024.9.1-universal/dist/extension.node.js:304:11641) > stdErr = 18:41:36.353 [info] Process Execution: ~/anaconda3/envs/infinigategenai/bin/python -c "import ipykernel;print('6af208d0-cb9c-427f-b937-ff563e17efdf')" ``` ---
**Author:** ![David\_Draper](https://avatars.discourse-cdn.com/v4/letter/d/e95f7d/32.png) [@David\_Draper](https://forum.cursor.com/u/David_Draper)\ **Post date:** [October 13, 2025, 8:41pm UTC](https://forum.cursor.com/t/kernal-issue-died/137238/5 "2025-10-13T20:41:21Z")
Any ideas on this as support hasn’t got back to me either? ---
**Author:** ![system](https://sea3.discourse-cdn.com/cursor1/user_avatar/forum.cursor.com/system/32/99069_2.png) [@system](https://forum.cursor.com/u/system)\ **Post date:** [November 5, 2025, 7:35am UTC](https://forum.cursor.com/t/kernal-issue-died/137238/7 "2025-11-05T07:35:38Z")
This topic was automatically closed 22 days after the last reply. New replies are no longer allowed.