Error: Failed to validate Claude CLI (Windows)

[enriquepiatti]

Hi, is this working in Windows? after executing: claude-code-webui I get this error:

❌ Failed to validate Claude CLI
Error: spawn EINVAL

[IMTanuki]

same - does anhyone test software anymore?

[sugyan]

This issue is being addressed in PR #193 which adds comprehensive Windows support. Please test with the latest version once that PR is merged.

[IMTanuki]

ok, thx!

[MuTsunTsai]

This error persists as of v0.1.38

[sugyan]

Thank you everyone for reporting this Windows issue and your patience! 🙏

I've implemented additional Windows-specific fixes in PR #198. Based on my testing, the Windows environment should now work correctly.

This fix is included in version 0.1.39. Please try updating to the latest version:

npm install -g claude-code-webui

Please let me know if you still encounter any issues after updating!

[MuTsunTsai]

@sugyan Still the same.

[sugyan]

@MuTsunTsai Thank you for the feedback!

While the package appears to be updated on npm, your error logs look different from what we'd expect to see with v0.1.39. Could you please help us verify which version you're actually running?

Please run these commands and share the output:

1. Check the version:

   claude-code-webui --version
   

2. Check the installation path:

   where claude-code-webui
   

   (or which claude-code-webui if you're using WSL/Git Bash)

This will help us determine if you're running the latest version or if there's a cached older version being executed. Since it looks like you might be using pnpm, sometimes global installs can have path resolution issues that cause an older version to be used instead of the newly installed one.

Thanks for your patience in helping us debug this!

[MuTsunTsai]

@sugyan Thanks for clarifying. Indeed, by running with --version it shows v0.1.37 despite the fact that I've already update it to v0.1.39 with PNPM (BTW, executing where shows that PNPM's is the only installation of it). If I uninstall and reinstall it completely, it then works fine in my environment. However, this implies that I will have similar trouble updating it in the future, so this issue should be addressed as well.

[sugyan]

@MuTsunTsai Thank you for confirming that v0.1.39 works correctly after reinstalling!

Regarding the pnpm update issue you mentioned - this appears to be related to how pnpm handles global package updates (there are several related issues in the pnpm repository such as pnpm/pnpm#5365). Unfortunately, this is not something we can address from the claude-code-webui side.

I was able to reproduce the same issue in my environment, and found that pnpm update -g --latest successfully updated to the latest version. As you discovered, a complete uninstall and reinstall also resolves the issue.

Always verify the version after updating with claude-code-webui --version to ensure you're running the expected version.

Thanks for your patience in helping us debug this! 🙏