I have a Panasonic Panafax DX-800 that I was given; it displays code 011,
"paper tray missing" in the window and, of course, it doesn't print.
(For lack of better description, it's a glorified black and white laser
printer/fax/scanner.)
However, I have the tray inserted, and it looks like it's fitting fine.
Since it was free, I don't know when it stopped working, etc., and the
prior owner just wanted to be rid of it and so probably wouldn't appreciate
me hassling him about what happened.
...
Panasonic Panafax DX-800: "tray missing" error
"paper tray missing" in the window and, of course, it doesn't print.
(For lack of better description, it's a glorified black and white laser
printer/fax/scanner.)
However, I have the tray inserted, and it looks like it's fitting fine.
Since it was free, I don't know when it stopped working, etc., and the
prior owner just wanted to be rid of it and so probably wouldn't appreciate
me hassling him about what happened.

Panasonic Panafax DX-800: "tray missing" error