Xcode - Unable to load authors information

Question

When I clicked Editor->Authors in Xcode, some files always complain "Unable to load author information". It happens even in the same subfolder, e.g., A.h is fine but A.m shows this error message.

I did some research but none solved my problem.

1. XCode: Unable to Load Author Information

2. Xcode can't check who to blame information

My file path is correct, and there's no other .git folders in my project.

Answer 1

I has similar problem, except "Unable to Load Author Information", Xcode also wasn't showing Source Control changes. For me restart of macOS solved the problem. I had problem only in one repo.