Getting rid of '… does not point to a valid object' for an old git branch

Question

I have a fork of a Git repo and my clone appears to have an issue with an old, no longer existant, branch. I keep seeing this message:

error: refs/heads/t_1140

Answer 1

error: refs/heads/t_1140 does not point to a valid object!

So let's say you've tried pruning with this:

git remote prune origin

and you still CAN'T GET IT TO WORK, as a last resort, try deleting t_1140

Basically,

1. cd refs/heads

2. rm -r t_1140