claude-code - 💡(How to fix) Fix [BUG] All cowork sessions (new & old) have the exact same RPC Error [1 participants]

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anthropics/claude-code#52148Fetched 2026-04-23 07:35:22
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Error Message

RPC error: failed to mount /mnt/.virtiofs-root/shared/Users/tessaanderson/Documents/Claude/Artifacts/team-cliftonstrengths-dashboard as .artifacts/team-cliftonstrengths-dashboard: source path does not exist and could not be created: /mnt/.virtiofs-root/shared/Users/tessaanderson/Documents/Claude/Artifacts/team-cliftonstrengths-dashboard: mkdir /mnt/.virtiofs-root/shared/Users/tessaanderson/Documents: file exists

Code Example

RPC error: failed to mount /mnt/.virtiofs-root/shared/Users/tessaanderson/Documents/Claude/Artifacts/team-cliftonstrengths-dashboard as .artifacts/team-cliftonstrengths-dashboard: source path does not exist and could not be created: /mnt/.virtiofs-root/shared/Users/tessaanderson/Documents/Claude/Artifacts/team-cliftonstrengths-dashboard: mkdir /mnt/.virtiofs-root/shared/Users/tessaanderson/Documents: file exists
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Preflight Checklist

  • I have searched existing issues and this hasn't been reported yet
  • This is a single bug report (please file separate reports for different bugs)
  • I am using the latest version of Claude Code

What's Wrong?

I was in the middle of creating a dashboard this morning, and I think it made an artifact as part of it, but now I get this error in the task I was working on, plus all old tasks and new tasks. I can't do anything in cowork without seeing this error. I think there was an issue with the artifact, some of the troubleshooting steps had me delete the artifact, but this error persists.

This morning there was an update that I did and relaunched. This happened after that update.

I tried deleting the task that was the issue to see if that would resolve anything, but nothing has worked. I have also done tons of troubleshooting steps

RPC error: failed to mount /mnt/.virtiofs-root/shared/Users/tessaanderson/Documents/Claude/Artifacts/team-cliftonstrengths-dashboard as .artifacts/team-cliftonstrengths-dashboard: source path does not exist and could not be created: /mnt/.virtiofs-root/shared/Users/tessaanderson/Documents/Claude/Artifacts/team-cliftonstrengths-dashboard: mkdir /mnt/.virtiofs-root/shared/Users/tessaanderson/Documents: file exists

(the only thing that has worked is running this prompt: rm -rf ~/Library/Application\ Support/Claude. BUT that deleted all my cowork history, which I need. I backed it up, and when I replaced it the issue came back. So it's something in the local agent session folder/files, but I don't know what)

What Should Happen?

I should be able to use a new cowork session, even if this one artifact session is broken, but I can't

Error Messages/Logs

RPC error: failed to mount /mnt/.virtiofs-root/shared/Users/tessaanderson/Documents/Claude/Artifacts/team-cliftonstrengths-dashboard as .artifacts/team-cliftonstrengths-dashboard: source path does not exist and could not be created: /mnt/.virtiofs-root/shared/Users/tessaanderson/Documents/Claude/Artifacts/team-cliftonstrengths-dashboard: mkdir /mnt/.virtiofs-root/shared/Users/tessaanderson/Documents: file exists

Steps to Reproduce

Type anything into a cowork session and you get the error. It is unavoidable.

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

No response

Claude Code Version

don't know, this prompt won't work for me

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

<img width="621" height="242" alt="Image" src="https://github.com/user-attachments/assets/b763acf2-8b55-4b9e-b27b-bc711c344b2b" /> <img width="696" height="412" alt="Image" src="https://github.com/user-attachments/assets/0aa30e9e-807e-4df6-b53f-ea453d193710" />

extent analysis

TL;DR

The issue is likely caused by a corrupted local agent session folder, and deleting the ~/Library/Application Support/Claude folder may resolve the issue, but at the cost of losing cowork history.

Guidance

  • The error message suggests that the issue is related to the mounting of a shared directory, specifically the team-cliftonstrengths-dashboard artifact.
  • The fact that deleting the ~/Library/Application Support/Claude folder resolves the issue, but loses cowork history, implies that the problem is with the local agent session files.
  • To mitigate the issue, try deleting only the specific files or subfolders related to the team-cliftonstrengths-dashboard artifact within the ~/Library/Application Support/Claude folder, instead of deleting the entire folder.
  • If the issue persists, try checking the permissions and ownership of the ~/Library/Application Support/Claude folder and its contents to ensure they are correct.

Example

No code snippet is provided as the issue seems to be related to file system and directory permissions rather than code.

Notes

The provided images do not seem to be relevant to the issue, and the Claude Code Version is not specified, which might be important for troubleshooting. Additionally, the Last Working Version is not provided, which could help identify when the regression occurred.

Recommendation

Apply workaround: Delete the specific files or subfolders related to the team-cliftonstrengths-dashboard artifact within the ~/Library/Application Support/Claude folder, and then try to use the cowork session again. This approach may help resolve the issue while preserving some of the cowork history.

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