domains and clients account's are not turnet off

[mr_exclusive]

Hi,

first sorry for my english.

I have a problem with my plesk 8.0.1, since a couple of days my plesk isn'y blocking clients accounts and domains of the clients, i get an error i error log:
Nov 20 04:01:58 mydomain statistics: Unable to off client by expiration: Client_name

i can turn the clients off manually, but why isn't it working automaic?

gr,
mr