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claude-code - 💡(How to fix) Fix [BUG] Cowork fails on macOS Tahoe 26.3.1 — "Session VM process not available" when adding folder [1 comments, 2 participants]

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anthropics/claude-code#51666•Fetched 2026-04-22 07:56:08
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pparkerpparker
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Error Message

Errors observed (in order):

  1. (earlier) RPC error: failed to mount /mnt/.virtiofs-root/shared/Users/pp/Documents/Claude as Claude: source path is not accessible: stat /mnt/.virtiofs-root/shared/Users/pp/Documents/Claude: operation not permitted
  2. (now) Session VM process not available

Code Example

**Errors observed (in order):**
1. (earlier) RPC error: failed to mount /mnt/.virtiofs-root/shared/Users/pp/Documents/Claude as Claude: source path is not accessible: stat /mnt/.virtiofs-root/shared/Users/pp/Documents/Claude: operation not permitted
2. (now) Session VM process not available
RAW_BUFFERClick to expand / collapse

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?

See Steps to Repro below.

Troubleshooting already attempted:

  1. Deleted ~/Library/Application Support/Claude/claude-code-vm & Deleted ~/Library/Application Support/Claude/vm_bundles
  2. Deleted entire ~/Library/Application Support/Claude

Full MacBook restart after each attempt. None resolved the issue

Is this a regression? Yes — was working before today.

What Should Happen?

Local folders should mount successfully in Cowork

Error Messages/Logs

**Errors observed (in order):**
1. (earlier) RPC error: failed to mount /mnt/.virtiofs-root/shared/Users/pp/Documents/Claude as Claude: source path is not accessible: stat /mnt/.virtiofs-root/shared/Users/pp/Documents/Claude: operation not permitted
2. (now) Session VM process not available

Steps to Reproduce

Version: Claude 1.3561.0 (fbc74b) 2026-04-20T14:59:51.000Z OS: macOS Tahoe 26.3.1, Apple Silicon

Steps

  • go to Cowork
  • add folder
  • browse to local folder
  • click open

What's Wrong?

  • Error: Session VM process not available. The session may not be fully initialized.

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

No response

Claude Code Version

Claude 1.3561.0 (fbc74b) 2026-04-20T14:59:51.000Z

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

No response

extent analysis

TL;DR

The issue is likely related to a permission or initialization problem with the Session VM process in Claude Code, and a potential workaround could involve reinitializing or reinstalling the application.

Guidance

  • Verify that the local folder permissions are correctly set and accessible by the Claude application.
  • Try reinstalling Claude Code to potentially resolve any corrupted or incomplete installation issues.
  • Check the macOS permissions and settings for the Terminal.app and Claude Code to ensure they are compatible and properly configured.
  • If possible, attempt to roll back to a previous version of Claude Code that was known to be working to isolate the issue.

Example

No specific code snippet is applicable in this case, as the issue appears to be related to application configuration and permissions rather than code-level problems.

Notes

The exact cause of the issue is unclear without further information about the application's internal workings and the specific changes made in the latest version. However, given that this is a regression and the problem persists after attempting to delete relevant support files and restarting, a reinstallation or a deeper dive into permission settings may be necessary.

Recommendation

Apply workaround: Reinstall Claude Code to potentially resolve any issues related to the Session VM process initialization or permissions. This approach is chosen because the problem is identified as a regression, suggesting that a previous version worked correctly, and reinstalling might revert to a working state or at least provide more insight into the issue.

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