[BUG] Claude Desktop Cowork hangs on "Sending request..." - path.conversation_uuid invalid UUID 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?
Claude Desktop Cowork mode hangs indefinitely on "Sending request..." even though the backend VM spawns processes successfully.
The web log shows this error every time a Cowork task starts:
[REACT_QUERY_CLIENT] QueryClient error: Error: path.conversation_uuid: Input should be a valid UUID, invalid character: expected an optional prefix of urn:uuid: followed by [0-9a-fA-F-], found l at 1
Additionally, the log shows:
[LOCAL_SESSION] unknown sdk message type: stream_event
The backend works (processes spawn, VM connects, mounts succeed), but the frontend never displays the response.
Tried and failed:
- Fresh reinstall of Claude Desktop
- Clearing all app data (Application Support/Claude)
- Clearing Local Storage, IndexedDB, Cookies
- Fresh login
- Different folders (Dropbox, Desktop, with/without spaces in names)
Regular Chat mode works fine. Only Cowork is affected.
Claude Code Version:
Claude Desktop 1.1.351
Operating System:
macOS (Darwin 25.2.0)
What Should Happen?
Cowork should display Claude's response instead of hanging on "Sending request..."
Error Messages/Logs
2026-01-18 14:17:23 [error] [REACT_QUERY_CLIENT] QueryClient error: Error: path.conversation_uuid: Input should be a valid UUID, invalid character: expected an optional prefix of `urn:uuid:` followed by [0-9a-fA-F-], found `l` at 1
2026-01-18 14:11:51 [warn] [LOCAL_SESSION] unknown sdk message type: stream_eventSteps to Reproduce
- Open Claude Desktop
- Go to Cowork tab
- Create new task
- Select any folder
- Send any message (e.g., "hi")
- Observe: UI stays on "Sending request..." forever
- Check ~/Library/Logs/Claude/claude.ai-web.log - shows UUID error
Claude Model
Opus
Is this a regression?
I don't know
Last Working Version
_No response_
Claude Code Version
Claude Desktop 1.1.351 / Cowork VM SDK 2.1.8
Platform
Anthropic API
Operating System
macOS
Terminal/Shell
iTerm2
Additional Information
_No response_
11 Comments
Found 1 possible duplicate issue:
This issue will be automatically closed as a duplicate in 3 days.
🤖 Generated with Claude Code
Same on Claude 1.1.381
Still happening on Claude 1.1.762 (35ba62)
@ryanbadger Still getting this error.
Same.
My theory is it’s related to network, possibly ISPs that have some sort of proxy. (Seems like anthropic blocks VPNs so possibly they don’t like ISPs doing things that might be seen as VPN behaviour?)
They suggested using this as the main bug report:
https://github.com/anthropics/claude-code/issues/18474
I'm on a VPN, so maybe that's the commonality.
Definitely try disabling that first.
Still getting this in Claude 1.1.886 (ef5d26).
Also having this issue too on Claude 1.1.886 (ef5d26). "API Error: Connection error."
Can confirm, hangs on the work VPN, although it has never blocked any other app/website.
This issue has been automatically locked since it was closed and has not had any activity for 7 days. If you're experiencing a similar issue, please file a new issue and reference this one if it's relevant.