Git Error: index uses extension, which we do not understand fatal: index file corrupt

Error: index uses extension, which we do not understand fatal: index file corrupt

This error can be solved by removing the index, and then restore index to version in the last commit.

If you are using Linux, run the below commands:

#rm -f .git/index
#git reset

If you are using Windows, run the below commands:

#del .git\index
#git reset

That's all…