Ricoh GX e7700n keeps saying it has a misfeed, but it's not jammed

Yesterday I went to print something and it gave me this message:

Rem msfd: Opn Tp
& LftCv use FWhl

If msfd persists
Rem Trays/Covers

I've opened all the covers, removed the bypass tray, the duplexer and the front paper tray, and there is no paper in it anywhere. I blew out all the insides with compressed air, and reassembled it several times in different orders. Sometimes when I reattach the duplexer the error goes away and it says "Ready" for a few seconds, and I can hear the printhead moving to the left, and when it stops the error comes back. HELP!