Solution: (Thanks to GeekyGirl007 comment bellow)
"The solution is to go into your Settings -> Printers and Scanners -> right click anywhere in the left hand box that lists your printers and a pop up will come on "reset printing system", click this. It will erase all your printers and scanners, but it solves the issue completely. You can then reinstall all your printers/scanners as needed. Hope this helps someone!"
The Article:
I upgaraded to Catalina macOS. Now when I try to save a document as pdf from Preview, I get an error: "Error while printing" as shown bellow
I found out that the error happens only with Preview. After troubleshooting, I found out that the error occurs only if the selected printer is not online! Although you are merely saving a pdf, still the real printer should be online. If it has the lightning symbol (see bellow), then you get the error. I am keeping my default printer always online now. Hope apple fixes the issue.
