Rerun -FirstRun

This error, while not usually expected, does happen occasionally. Please re-run -FirstRun using the WAM Shell. It may require between 2-15 times (each -FirstRun time should get shorter and shorter for running time). Open the WAM Shell from the Windows Menu (Windows Menu > Programs > AJ Tek > WSUS Automated Maintenance > WAM Shell) and run:

.\Clean-WSUS.ps1 -FirstRun