James Phelps8,262 Points
git repo not working "fatal: bad object HEAD" - seen as a rare issue
I am unable to use the git repo and therefore am unable to complete this course - I have seen a similar issue within the comments section but the thread just ends with no answer!!!!
How far have you got into the course? Can you run
git init again to reset the local repo? You might need to ditch some files too.
While I don't usually recommend Stack Overflow as it is a pretty hostile environment - there's a useful thread here that might help you out too.
Hope this helps.