Hi @jdrios and thank you for your reply.
I have installed the support tool you proposed, I ran it but the following message appeared on the screen (without any code to share).
It took a while to finish and then the command line showed up with no additional information.
Also, after running the tool, when I try to rescore a problem, now a different error occurs, the following:
'Error starting a task to rescore problem 'xxx' for student 'xxx'. Make sure that the the problem and student identifiers are complete and correct.'
Also now, I cannot generate grade report from my instructor tab, which I could before running the tool.
Is it possible that the tool messed something up?