The screenshots would be very helpful in troubleshooting. It almost sounds like you are missing the PG code, though that seems unlikely if you are using the existing VM image.
Check that the /opt/webwork/pg folder is present, and has the appropriate permissions. Otherwise please post the exact error message or the screenshots.
Check that the /opt/webwork/pg folder is present, and has the appropriate permissions. Otherwise please post the exact error message or the screenshots.