# Failed to read file

**URL:** <https://forum.cursor.com/t/failed-to-read-file/133582>\
**Category:** Bug Reports\
**Created:** [September 16, 2025, 4:26am UTC](https://forum.cursor.com/t/failed-to-read-file/133582 "2025-09-16T04:26:25Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![silly](https://sea3.discourse-cdn.com/cursor1/user_avatar/forum.cursor.com/silly/32/65017_2.png) [@silly](https://forum.cursor.com/u/silly)\
**Post date:** [September 16, 2025, 4:26am UTC](https://forum.cursor.com/t/failed-to-read-file/133582/1 "2025-09-16T04:26:25Z")

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

Cursor IDE

### Describe the Bug

I was using it when suddenly it prompted “Failed to read file.”

### Steps to Reproduce

I don’t know if it’s because this file has over 8,000 lines of code, but anyway, the previous conversation was working normally, while the next one didn’t work. Even creating a new chat to read this file didn’t work, but it can read other files

### Operating System

MacOS

### Current Cursor Version (Menu → About Cursor → Copy)

版本: 1.6.23 (Universal)  
提交: 1.99.3  
日期: 9b5f3f4f2368631e3455d37672ca61b6dce85430  
Electron: 2025-09-15T21:47:50.112Z  
ElectronBuildId: 34.5.8  
Chromium: undefined  
Node.js: 132.0.6834.210  
V8: 20.19.1  
OS: 13.2.152.41-electron.0

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

sonnet 4

### For AI issues: add Request ID with privacy disabled

Request ID: a1d86c11-9221-4c5c-bca7-16e8cf0e3860  
{“error”:“ERROR\_BAD\_REQUEST”,“details”:{“title”:“Tool call error”,“detail”:“Failed to read file.”,“additionalInfo”:{},“buttons”:,“planChoices”:},“isExpected”:true}  
ConnectError: [invalid\_argument] Error  
at yyl.$endAiConnectTransportReportError (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:4910:339807)  
at Qvr.\_doInvokeHandler (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:487:36019)  
at Qvr.\_invokeHandler (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:487:35761)  
at Qvr.\_receiveRequest (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:487:34526)  
at Qvr.\_receiveOneMessage (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:487:33348)  
at WCt.value (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:487:31442)  
at ye.\_deliver (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:49:2962)  
at ye.fire (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:49:3283)  
at Vot.fire (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:4895:12154)  
at MessagePort. (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:7028:18292)

### Does this stop you from using Cursor

Yes - Cursor is unusable

 ![PixPin_2025-09-16_12-20-10](https://us1.discourse-cdn.com/cursor1/original/3X/8/d/8df8abd0f16371951f47306574a7d6bbe62bf41e.png)

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<div class="post-metadata">

**Author:** ![silly](https://sea3.discourse-cdn.com/cursor1/user_avatar/forum.cursor.com/silly/32/65017_2.png) [@silly](https://forum.cursor.com/u/silly)\
**Post date:** [September 16, 2025, 4:37am UTC](https://forum.cursor.com/t/failed-to-read-file/133582/2 "2025-09-16T04:37:49Z")

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I think I’ve solved it. By creating a new chat and switching models to have a successful conversation, then switching back, it seems to be restored.

However, if it’s still the sonnet4 model, directly reading this page in a new chat will still have this issue.I think I’ve solved it. By creating a new chat and switching models to have a successful conversation, then switching back, it seems to be restored. However, if it’s still the sonnet4 model, directly reading this page in a new chat will still have this issue.

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<div class="post-metadata">

**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:** [October 8, 2025, 4:37am UTC](https://forum.cursor.com/t/failed-to-read-file/133582/3 "2025-10-08T04:37:52Z")

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Closed on October 8, 2025, 4:37am UTC

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