AMgr: Agent record found in Eligible Task queue, marked for deletion

hi evrybody,im facing problems with sch agents…i done 5 sch agents in one database… these ran successfully upto saturday…these are not running after that… manullay its working gud…

when i sch the agent in log i found the msg that :

AMgr: Agent record found in Eligible Task queue, marked for deletion

and there is no error msgs in log…

tell me the sol for this…