Plesk Error creating user

When i create a user i always face with an error seems below
plesk 9.5.1

ERROR: PleskFatalException
Unable to load object of type Notification with id=1: Notification: unable to select: no such row in the table

Additionally, an exception has occurred while trying to report this error: PleskLimitException
There are no available resources of this type (clients) left. Requested: 1; available: 0.

0: common_func.php3:3159
	objectMakerEx(string 'Notification', integer '1')
1: NotificationManager.php:59
	NotificationManager->addNotification(integer '1', array)
2: notifications.php:37
	notificationsEventListener->handleEvent(string 'client', integer '3', string 'client_create', array, array)
3: :
	call_user_func_array(array, array)
4: InterfacesManager.php:112
	InterfacesManager::callImpls(string 'EventListener', string 'handleEvent', array)
5: class.ActionLog.php:801
	ActionLog->callEventListeners()
6: class.ActionLog.php:682
	ActionLog->submit()
7: class.Client.php3:421
	Client->update()
8: ClientPropertiesUIPointer.php:180
	ClientPropertiesUIPointer->accessItem_create(string 'POST', NULL null)
9: ClientPropertiesUIPointer.php:45
	ClientPropertiesUIPointer->accessItem(string 'POST', NULL null)
10: UIPointer.php:596
	UIPointer->access(string 'POST')
11: plesk.php:38

Select allOpen in new window