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An internal paper sensor has either been triggered, or tripped, or fouled, and is indicating the presence of paper inside the machine. Check the entire paper path, the course that the paper takes while being printed upon from start to finish within the printer, for any paper sheets, or paper scraps/dust/fluff, that might be triggering this error.
Also, check for spilled toner. Optical paper sensors can get toner on them, and be permanently stuck in the 'paper jam indicated' state until the toner is simply wiped away with a clean dry cloth.
Note: do not wipe the transfer film, nor the blue-ish metallic-looking drum surfaces; That would damage them beyond repairing in all likelihood.