My WSUS server is not connected to domain so I don't have anything in: Computers>All Computers > [WSUS server] >

I use group policy management console, then on OU I click Group Policy Update.
On administrator Powershell when I did: Invoke-GPUpdate –computer pc01 -force
then I don't get any error.

I run this command on domain controller, and use group policy update from domain controller also.