WotLK I'm bugged into a group that doesn't exist

[Ronett]

I was doing the violet bastion on heroic until when we entered we were missing the tank, when we queued to look for a new tank it told us that the group was full, then everyone left except me, since being the last one it wouldn't let me leave the group and now it tells me that I can't search for a dungeon or invite my friends to a group because it says that I'm in a group that doesn't exist and that I can't leave, pls help me

[BlueAo]

/script LeaveParty ()