Couldn't create a role group of type 'AdminCc'

Hi,

My RT 4.4.1 was running fine around 1 month back. Now, when I am trying to create a ticket, getting an error as below:
Couldn’t create a role group of type ‘AdminCc’ for RT::Ticket 1: Role group exists already
Couldn’t create ticket groups for ticket 1. aborting Ticket creation.
Ticket creation failed: Ticket with users in CC: Ticket could not be created due to an internal error

I hadn’t change anything in last one month. Now I tried to restore from backup, also I tried to reinstall mysql. But, still getting the same error. I searched on internet for this error but, no luck. Please help.

Thanks,
Ravi

After restoring from a backup file, first ticket I am able to create but after that getting above error.