You should ask whoever maintains the repo at
Your commits were rejected by the
pre-receive hook of that repo (that’s a user-configurable script that is intended to analyze incoming commits and decide if they are good enough to be accepted into the repo).
It is also a good idea to ask that person to update the hook, so it would print the reasons for the rejection.
If the maintainer is you yourself, then it looks like you’ve got a problem with your setup on the server-side. Please share more information then.