"Couldn ¹ t create ticket due to internal error" Any Ideas?

Attempted Ticket Creation through E-Mail:
[error]: Couldn’t create a ticket group of type ‘Requestor’ for ticket
1473:Could not create group (/home/rt/lib/RT/Ticket_Overlay.pm:1314)

[crit]: Couldn’t create ticket groups for ticket 1473. aborting Ticket
creation. (/home/rt/lib/RT/Ticket_Overlay.pm:528)

[crit]: Ticket could not be created due to an internal error
(/home/rt/lib/RT/Interface/Email.pm:579)

[error]: Create failed: 0 / 0 / Ticket could not be created due to an
internal error (/home/rt/lib/RT/Interface/Email.pm:583)

Attempted Ticket Creation through RT:
[error]: Couldn’t create a ticket group of type ‘Requestor’ for ticket 1474:
Could not create group (/home/rt/lib/RT/Ticket_Overlay.pm:1314)

[crit]: Couldn’t create ticket groups for ticket 1474. aborting Ticket
creation. (/home/rt/lib/RT/Ticket_Overlay.pm:528)

[error]: WebRT: Ticket could not be created due to an internal error ()
(/home/rt/share/html/Elements/Error:53)

RT was running fine until Friday when a co-worker set up a new queue and
added new users. Now whenever there is a ticket creation attempt I get the
above errors. Any ideas? Could it be a database problem? Sorry RT
newbie here. =/

-Nick