Failed to open a connection to the device (-21345)
Out of the blue, Image Scanner is no longer working. The error message says "Failed to open a connection to the device (-21345)"
I have a Mac, wirelessly connected to a HP8600 printer. Using Catalina operating system.
Tried unplugging printer, printer power cable, and then replugging everything after several minutes. No luck.
iMac 21.5″, macOS 10.13