Print Spooler service is a component and requires Remote Procedure Call (RPC) to be started before the component itself can be started. Right-click on 'Print Spooler' and select 'Start'. If an error appears and or Print Spooler cannot be started, right-click on Print Spooler
This error may also appear as the similarly worded "App Name" can't be opened because it was not downloaded from the Mac App Store." depending on the security settings on your computer. A sample of the error is shown below: