Unstaged changes left after git reset --hard

I have resolved this problem using following steps

1. Remove every file from Git's index.

   git rm --cached -r .
   

2. Rewrite the Git index to pick up all the new line endings.

   git reset --hard
   

Solution was part of steps described on Configuring Git to handle line endings

I had the same problem and it was related to the .gitattributes file. However the file type that caused the problem was not specified in the .gitattributes.

I was able to solve the issue by simply running

git rm .gitattributes
git add -A
git reset --hard