Original User: hanidraidi
Dear Wayne and William, thanks a lot, I have no layers referenced to the versions, and to make sure I deleted all versions, but that didn't resolve the problem. By chance, I used "Import" instead of "Add and entering the instance, the logins, and the database connection" in register database (Server Properties>>Data Store>>+>> Import) and that worked, and I made sure that using "Add" will not register the database properly and cause this error but I don't know why!!!!
Regards,
Hani
Note: I am working on a test machine, not on the production one. Wayne, Thank you very much for your attention.