Excelsior

In the short time I've been here everyone's been so helpfull. My account is 10 days old but I can't seem to do the Rat Quest. He keeps saying I'm busy come back later. I thought that might mean I didn't finish the quest but went back in and killed 30 more rats and still got the same message. Does anyone know what could be the problem?

single left click on yourself and cancel any other quests you might have. You can only have one active one at a time.