Carousel error 8550dn

Hey there.
That indicates that the color toner carousel is not working
correctly. This could be caused by an obstruction in
the carousel path, such as a loose shutter or
disengaged toner cartridge.
Open the carousel door and waste toner tray.
Look for an obstruction, such as a toner
cartridge shutter catching on the waste toner
tray. Verify the toner lock lever is fully locked. If
the message does not clear after closing the
doors, turn the printer off and on to reset the
printer.