Why is git erroring with 'Assertion failed' on git add .?

Question

I forked a repo, then cloned it to my Mac into a /YATC directory. I had a previously-created Xcode project (TwitterTimeline) in another directory, which I copied in

Answer 1

I got this problem too,Here is my way to fix this:

1. delete the .git folder in the submodule folder(if you did this before, go 2)
2. then excute follow command, directory is your submodule folder git rm --cached directory git add directory
3. then you can upload this folder like others