Q: When RTG Timer starts up, it says Printer error and when I click OK, it exits.

A: The first time RTG Timer runs, it reads the fonts for the Windows default printer. You will get this message if you don't have any printers defined for this computer.

You must install a printer for your computer, even if you never actually use a printer with this computer. Choose:

Settings > Bluetooth & devices > Printers & Scanners

If no printers are listed, click Add device and add a printer.