Either uninstall/reinstall Sage, as that should resolve the pdf printing issue, or, we use Foxit PDF Reader here, and it comes with a pdf printer as well, which shows up in the printer list after it's successfully installed. You can select that option as well to print to a PDF.

I just had the same error yesterday, even when I tried the Foxit PDF Printer, but found Foxit hadn't been updated on the given PC in quite a while, so after I upgraded the application to the current version, all was well again.

Hopefully it's nothing more than something simple like that, but let me know if you continue to experience issues!