hi y'all -
you share a frustrating problem... error message but no apparent error (jam)! it's one that's common to many models of printers and the result of many different causes.
I've seen it when I've printed on cheaper paper, or different (lower) grades with odd surface finishes. the sensors get dirty, or the printer/computer 'thinks' there's paper stuck where none exists. I've opened/closed paper trays 2-3 times and rolled feed rollers around multiple times, then closed printer paper drawers only to have the 3rd time of doing the exact same steps be the time it cleared the error message.
there are often very tiny pieces of paper stuck in weird places in the paper path in printers, too. if you did have a jam before the message started, is every little scrap of the page accounted for? there are also hard to get to places to find paper scraps in larger printers, but I'm going to assume you're all talking about home printers.
here are a few general HP support links you may find helpful for future paper jam messages for this model of printer.
this link is for general info for this model:
this link is for general support for this model:
here's a link addressing paper jams in general:
and here's one on cleaning your printer:
hope this helps a little bit for future refs. remember that using good paper helps print quality and lessens printing problems. also, when you take a stuck page out of a printer, doing so gently will help ensure little scraps of paper do not tear off paper edges and get stuck in weird spots. it some times helps to gently, manually, roll the feed rollers a full turn around in the printer, too. patience pays! -JW50