# After upgrade to Cursor v3.9.16 existing workspaces chat's don't work

**URL:** <https://forum.cursor.com/t/after-upgrade-to-cursor-v3-9-16-existing-workspaces-chats-dont-work/164341>\
**Category:** Bug Reports\
**Tags:** agents-window, installation, chat\
**Created:** [June 29, 2026, 8:59pm UTC](https://forum.cursor.com/t/after-upgrade-to-cursor-v3-9-16-existing-workspaces-chats-dont-work/164341 "2026-06-29T20:59:44Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Johann\_Kriek](https://avatars.discourse-cdn.com/v4/letter/j/e95f7d/32.png) [@Johann\_Kriek](https://forum.cursor.com/u/Johann_Kriek)\
**Post date:** [June 29, 2026, 8:59pm UTC](https://forum.cursor.com/t/after-upgrade-to-cursor-v3-9-16-existing-workspaces-chats-dont-work/164341/1 "2026-06-29T20:59:44Z")

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### Where does the bug appear (feature/product)?

Cursor IDE

### Describe the Bug

I’m unable to continue or start conversation in existing workspace. Same applies in Agents Window. In Editor Window it works but only with new window.

### Steps to Reproduce

See description.

Request ID: 1a25db6a-4229-43fc-9a6e-4a35be6ef4e9  
No resource accessor found for composer: 3f9dc903-4250-44b3-9ab2-1c8f15f0e4e6  
Error: No resource accessor found for composer: 3f9dc903-4250-44b3-9ab2-1c8f15f0e4e6  
at Lkh.streamFromAgentBackend (vscode-file://vscode-app/c:/Users/JohannKriek/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:24505:5851)  
at Lkh.getAgentStreamResponse (vscode-file://vscode-app/c:/Users/JohannKriek/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:24505:22899)  
at IRe.submitChatMaybeAbortCurrent (vscode-file://vscode-app/c:/Users/JohannKriek/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:12142:736)  
at async Object.du [as onSubmit] (vscode-file://vscode-app/c:/Users/JohannKriek/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:23548:34996)  
at async vscode-file://vscode-app/c:/Users/JohannKriek/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:21445:104651

### Operating System

Linux

### Version Information

Version: 3.9.16 (user setup)  
VS Code Extension API: 1.105.1  
Commit: 042b3c1a4c53f2c3808067f519fbfc67b72cad80  
Date: 2026-06-27T06:41:01.941Z  
Layout: editor  
Build Type: Stable  
Release Track: Default  
Electron: 40.10.3  
Chromium: 144.0.7559.236  
Node.js: 24.15.0  
V8: 14.4.258.32-electron.0  
xterm.js: 6.1.0-beta.256  
OS: Windows\_NT x64 10.0.26100

### For AI issues: which model did you use?

Any and all

### Does this stop you from using Cursor

Yes - Cursor is unusable

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<div class="post-metadata">

**Author:** ![Johann\_Kriek](https://avatars.discourse-cdn.com/v4/letter/j/e95f7d/32.png) [@Johann\_Kriek](https://forum.cursor.com/u/Johann_Kriek)\
**Post date:** [June 29, 2026, 9:01pm UTC](https://forum.cursor.com/t/after-upgrade-to-cursor-v3-9-16-existing-workspaces-chats-dont-work/164341/4 "2026-06-29T21:01:14Z")

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## **Root cause**

Your `azure.code-workspace` had `"folders": []` (an empty multi‑root workspace). That’s why:

- It only broke in **that** window (it’s the only one opening that workspace file).
- New chats, old chats, and MCP‑off all failed identically — the request died **before** the network (`pre_network_to_abort_ms ≈ 20ms`, `isConnectError: false`), with the internal error _“No resource accessor found for composer.”_
- “Connection failed” was a misleading label for an internal workspace‑binding failure, not a real network/MCP issue.

## **Do this now**

1. Go to the broken window and reload it: `Ctrl+Shift+P` → **Developer: Reload Window** (or close the workspace and reopen `azure.code-workspace`).
2. Chats should work immediately.
3. You can **re‑enable your three MCP servers** — they were never the cause.

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<div class="post-metadata">

**Author:** ![kevinn](https://sea3.discourse-cdn.com/cursor1/user_avatar/forum.cursor.com/kevinn/32/101206_2.png) [@kevinn](https://forum.cursor.com/u/kevinn)\
**Post date:** [June 29, 2026, 9:12pm UTC](https://forum.cursor.com/t/after-upgrade-to-cursor-v3-9-16-existing-workspaces-chats-dont-work/164341/9 "2026-06-29T21:12:49Z")

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Hi @Johann_Kriek Thanks very much for responding back here with your solution. I gave you a badge as a thanks!

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**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:** [July 1, 2026, 9:13pm UTC](https://forum.cursor.com/t/after-upgrade-to-cursor-v3-9-16-existing-workspaces-chats-dont-work/164341/10 "2026-07-01T21:13:34Z")

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