I've tracked down our messages when this occurred and I think we had a different error to you, sorry.

In case it helps our problem was when the below command was run in the repository:
$ git remote -vReturned the https address rather than the ssh address.
Then clearml tried to convert this to the ssh address, which looked like
<org>/<repo>/rather than
:<org>/<repo>.git(Which is possible a separate bug?)