Samsung CLX-2160 - "scan unit open or paperjam2" error

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My CLX 2160 printer is showing the error message "scan unit open or paperjam2". I have checked everywhere and there is no paper jammed in the printer. I have opened the back, checked underneath (tray feeding area) and opened the front. There is no apparent paper jam. I have also cleaned all the rollers I can see. None of this has fixed the problem. Any solution would be greatly appreciated.

EDIT: Problem solved! I checked under the scanner unit, where I found the paperjam.