When you set up SIMS-Sync the Scheduled Task is set to run out of school hours and update any new information that has been added to SIMS.
When you set up the Scheduled Task in SIMS-Sync, you will need to use an Administrator Windows account to do this. The Windows account must have high enough permissions to be able to set the task and SIMS-Sync will warn the user if this is not the case.
However, in some cases the Scheduled Task may be set up with an insufficient account and this may cause the following error within the event logs:
The system.unauthorizedaccess, P10 NIL is an account permissions issue. For more information please see this Microsoft Documentation: http://support.microsoft.com/kb/937868
The solution for this error is to use a Windows Administrator account with sufficient permissions.