What is causing Invalid Printer in Crystal Server 4.1?

I want to schedule a report to be printed. I have ticked "No Printer" when creating it in Crystal Reports.

I have added the printer to the server.

I have added it into CMC > Applications > Crystal Reports configuration > Printer List

Default Settings > Print Settings = Print Crystal reports when Scheduling (ticked) and Specif Printer chosen, my newly added printer selected

When I "Run Now", it errors with message "Invalid printer specified. ~ce1e44b099df3142.rpt"

What do I need to check & fix?

We are running Crystal Server: SAP BusinessObjects BI Platform 4.1 Support Pack - Version: 14.1.4.1327