claude-code - 💡(How to fix) Fix [BUG] Windows: Cowork fails to start - “VM service not running” (app hang / stuck) [1 participants]

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anthropics/claude-code#48001Fetched 2026-04-15 06:36:11
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Error Message

Exact error: “Failed to start Claude’s workspace - VM service not running. The service failed to start.”

Error Messages/Logs

  1. start typing a command and eventually I get an error

Code Example

Failed to start Claude's workspace
VM service not running. The service failed to start.
Restarting Claude or your computer sometimes resolves this. If it persists, you can reinstall the workspace.
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?

Desktop app version: Version 1.2278.0 (e5213f) OS: Windows (Intel x64) Exact error: “Failed to start Claude’s workspace - VM service not running. The service failed to start.” What you tried: enabled Virtual Machine Platform, restarted Claude Desktop, restarted PC, reinstalled workspace, and Task Manager shows Claude processes + cowork-svc running but stuck at 0% CPU. Logs: Event Viewer → Windows Logs → Application shows Event ID 1001 (MoAppHang) for Claude around the time you start Cowork

What Should Happen?

Claude Cowork should work

Error Messages/Logs

Failed to start Claude's workspace
VM service not running. The service failed to start.
Restarting Claude or your computer sometimes resolves this. If it persists, you can reinstall the workspace.

Steps to Reproduce

  1. open Claude on windows computer
  2. click on cowork
  3. start typing a command and eventually I get an error This has never worked and I've gone through a lot of troubleshooting steps.

Claude Model

Other

Is this a regression?

No, this never worked

Last Working Version

No response

Claude Code Version

Version 1.2278.0 (e5213f)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Windows Terminal

Additional Information

No response

extent analysis

TL;DR

The issue is likely related to the VM service not starting, and a potential workaround is to investigate and resolve the MoAppHang error (Event ID 1001) in the Windows Event Viewer.

Guidance

  • Investigate the MoAppHang error (Event ID 1001) in the Windows Event Viewer to understand the cause of the VM service failure.
  • Check the system resources and configuration to ensure that the Virtual Machine Platform is properly enabled and configured.
  • Consider reinstalling the Virtual Machine Platform or updating the Windows operating system to the latest version.
  • Verify that the cowork-svc process is running and not stuck at 0% CPU usage, and try terminating and restarting the process if necessary.

Example

No code snippet is provided as it is not clearly supported by the issue.

Notes

The issue may be related to a configuration or system resource problem, and resolving the MoAppHang error may require additional troubleshooting steps. The fact that reinstalling the workspace and restarting the computer did not resolve the issue suggests that the problem may be more complex.

Recommendation

Apply workaround: Investigate and resolve the MoAppHang error (Event ID 1001) in the Windows Event Viewer, as this is the most likely cause of the VM service failure.

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claude-code - 💡(How to fix) Fix [BUG] Windows: Cowork fails to start - “VM service not running” (app hang / stuck) [1 participants]