How to “resolve fatal: Not a git repository”?

Question

I was trying to remove one sub-module from the project

Tried rm -rf .git/modules/submodulePath

After that I am having the issue

Answer 1

I ran into this and didn't have a .git/modules directory in my main repository. I have one submodule 'build', so just removed any references and reinitialized it:

rm -rf .git/modules
rm -rf build
git submodule init
git submodule update