I'm trying to synchronize my forked repository on github. I follow instruction from this post: How do I update a GitHub forked repository?, but unfortunately when I push changes to GitHub I receive the following error:
remote: error: object 349e70933e59bab5094d8991a7ac35862d46e759:not properly sorted
remote: fatal: Error in object
error: unpack failed: index-pack abnormal exit
What does it means and how to resolve this problem?