[BUG] All cowork sessions (new & old) have the exact same RPC Error

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] 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" />