Today, I found that PyCharm was no longer able to push or pull from GitHub. It can still see all of my repositories. However, if I choose "test" from the "clone repository" window, or attempt to pull or push from an existing repo, I get an error message like the one in the dialog below. I have tried deleting my JetBrains configuration and starting over. I have not yet tried completely uninstalling and reinstalling PyCharm because that takes forever.
I should say that I can happily pull and push from the same repositories at the command line.