Canon imageRUNNER 6570 Reference Manual page 546

Remove the paper from the booklet tray.
Cause
Remedy
Replace toner cartridge.
Cause
Remedy
Place the original on the platen glass.
Cause
Remedy
Remove the original from the platen glass.
Cause
Remedy
Remove the original from the feeder.
9
Cause
Remedy
Original scanning area (thin glass strip) is dirty.
Cause
Remedy
9-74
List of Error Messages
Prints from the previous job remain in the Booklet tray of the optional Saddle
Finisher-T2.
Remove the prints from the Booklet tray. Printing automatically resumes.
Printing is not possible because the toner has run out.
Replace the toner cartridge. (See "Replacing the Toner Cartridge," on p. 8-32.)
The specified mode requires that the original be placed on the platen glass, but
there is no original on the platen glass.
Place the original on the platen glass.
An original remains on the platen glass.
Remove the original from the platen glass, and place the new original.
The machine cannot scan your original using the feeder. An original is placed in
the feeder and on the platen glass.
Remove the original from the feeder.
The feeder's scanning area is dirty.
Clean the feeder's scanning area. (See "Manual Feeder Cleaning," on p. 8-39.)