Error when creating task in Task Scheduler

I am try to create task in my windows 2003 server task scheduler.

but this error keep poping up.

"0x80070005: Error encountered while creating scheduled task."

I cannot proceed to create new task on the scheduler.

GPO and local policy did not show any restrictions on creating new task.

I also find creating on a old windows 2000 server giving the same error.

I saw some KB (841873) abt windows XP giving the same error. but this does not applies to server.

i have found one policy that disable creating task for my domain controller but there is no such policy for member servers.

i have since disable that policy for domain controller.