Seems to have nothing to do with your project. As soon as this error appears, all my projects refused to start with the same issue.
I could fix it once by starting the app in the simulator, after that all worked as before.
8thDwarf
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution
Last seen
User for
Post
Replies
Boosts
Views
Activity
Restarting the device also works for me.