Xcode can't check who to blame information

Question

When I used Xcode's Authors function, I couldn't load git history and got following prompt. It used work. I don't know how to fix this.

Answer 1

Finally I got it fixed.

The problem was that I had another .git somehow at a subfolder.

After I deleted that git with rm -rf .git from that sub folder and restarted Xcode. Everything worked fine.