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claude-code - 💡(How to fix) Fix [BUG] Claude Cowork shows "Virtual Machine Platform not available" — yukonSilver marked as unsupported despite all virtualization features enabled [2 comments, 2 participants]

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anthropics/claude-code#45140•Fetched 2026-04-09 08:12:19
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aksuzelal94-hubaksuzelal94-hub
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aksuzelal94-hubaksuzelal94-hubgithub-actions[bot]github-actions[bot]
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Error Message

Error Messages/Logs

  1. Observe the error: "Virtualization is not available — Claude's workspace requires

Code Example

Virtualisierung ist nicht verfügbar
Claudes Workspace benötigt Virtual Machine Platform, aber der Virtualisierungsdienst antwortet nicht. Starte deinen Computer neu, um dies zu beheben.
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?

When I try to do my very first project on Claude Cowork its not working. Its written Virtualisierung ist nicht verfügbar Claudes Workspace benötigt Virtual Machine Platform, aber der Virtualisierungsdienst antwortet nicht. Starte deinen Computer neu, um dies zu beheben.

What Should Happen?

Claude should help out with this problem so people me included could use Cowork without any problems

Error Messages/Logs

Virtualisierung ist nicht verfügbar
Claudes Workspace benötigt Virtual Machine Platform, aber der Virtualisierungsdienst antwortet nicht. Starte deinen Computer neu, um dies zu beheben.

Steps to Reproduce

  1. Install Claude Desktop (latest version) from claude.ai/download on Windows 10 Pro
  2. Open Windows Features ("Windows-Features aktivieren oder deaktivieren") and enable:
    • Hyper-V
    • Virtual Machine Platform
    • Windows Hypervisor Platform
  3. Run in PowerShell (as Administrator): bcdedit /set hypervisorlaunchtype auto
  4. Restart the computer
  5. Open Claude Desktop and navigate to the Cowork tab
  6. Observe the error: "Virtualization is not available — Claude's workspace requires Virtual Machine Platform, but the virtualization service isn't responding."

System verification:

  • Get-Service CoworkVMService → Status: Running
  • All three Windows virtualization features: Enabled
  • cowork_vm_node.log shows repeatedly: "yukonSilver not supported (status=unsupported), checking for stale bundle..."
  • Restarting multiple times does not resolve the issue.

OS: Windows 10 Pro

Claude Model

Sonnet (default)

Is this a regression?

No, this never worked

Last Working Version

No response

Claude Code Version

Claude Desktop v1.1062.0 (b81bcd) — Claude Code CLI not installed.

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

Im looking forward to use Cowork ASAP. So I am thankful for reaching out.

extent analysis

TL;DR

The issue is likely due to the virtualization service not responding, and a potential workaround is to disable and re-enable the Virtual Machine Platform feature.

Guidance

  • Verify that the Virtual Machine Platform feature is enabled and the Hyper-V service is running: check the Windows Features and the status of the Hyper-V service.
  • Try disabling and re-enabling the Virtual Machine Platform feature to see if it resolves the issue.
  • Check the cowork_vm_node.log for any other error messages that may indicate a different issue.
  • Ensure that the bcdedit /set hypervisorlaunchtype auto command was executed successfully and the computer was restarted afterwards.

Example

No code snippet is provided as it is not necessary for this issue.

Notes

The issue may be specific to the Windows 10 Pro operating system and the Claude Desktop version. The fact that the cowork_vm_node.log shows a repeated error message about "yukonSilver not supported" may indicate a compatibility issue.

Recommendation

Apply workaround: try disabling and re-enabling the Virtual Machine Platform feature, as it may resolve the issue with the virtualization service not responding.

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#api#pipeline error#runtime error#dependency conflict#environment setup

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claude-code - 💡(How to fix) Fix [BUG] Claude Cowork shows "Virtual Machine Platform not available" — yukonSilver marked as unsupported despite all virtualization features enabled [2 comments, 2 participants]