Did you install some mods recently? Usually, this trouble may appear if some app prevents the proper running of the AJAX query. Plz try to check the error lo of your server.
Yes I made a clone of the Organization Module. I did it while I was running 12.0.0 and it worked fine. However, I removed the clone before updating to 12.1.0, updated all modules and did a new clone for the new version.
I have tried to deactivate the clone and test again but still having same issue. I have done same thing I did while running 12.0.0.