I have had to turn off the "Dsiplay SCM Sync Status" on my system,
because I am getting the attached error twice every 20 minutes or so, and it is making the screen scroll to display all the errors.

Checking the SCM process to fix
I cd to /var/lib/jenkins/scm-sync-configuration/checkoutConfiguration
Run "git status", and get the this:

On branch master
Your branch is up-to-date with 'origin/master'.
nothing to commit, working directory clean

Still get the same error on the next run.