What does the 'Paper Jam' error usually indicate when scanning with an Epson printer scanner?

The 'Paper Jam' error, even if you don't see any jammed paper, often indicates a sensor malfunction within the scanner unit. Try restarting the printer and scanner, cleaning the scanner glass with a microfiber cloth, and running the printer's diagnostic test to check sensor functionality. If the problem persists, a service repair might be needed.