It is been observer while attempting to Deleting any set from Set Management ( Backup selection, Plugin option , schedule set etc ..) fails with the error " Error : Failed to Delete the set from the Database: Job(s) are using set.
Delete the Idle Job(s) from Manage Job(s) definition, which is associated with the set which needs to be deleted or Edit the Job(s) and use a different set instead of the one which needs to be deleted
