Error "Build service could not create build operation: unknown error while handling message: unknownSession"

Question

How do you debug that kind of Xcode's error when you don't have anything useful to start with?

Build service could not create build operation: unknown error while handling message: unknownSession

When having that issue, the 'Clean Build Folder' is starting, but never ends.

The only work around that I found is to quit Xcode and start it again.

Things that I already done:

• Manually delete files in DerivedData
• Install the latest 13.4 version

Answer 1

For people having that same issue, I suggest you to stay with Xcode 13.2 or lower for now.

Hopefully, 13.5+ or 14.x will fix that issue.