Power off your device.
Open left cover (door on the left side)
You will see white waste box (bottle) and black part with label how to change waste box. Put your palm on it and push it.
Power on your device.
Problem should be solved.

The drum is not setting correctly, check the gear on the drum try to move it, if the drum is not moving you might need new drum. but most of the time when you pull the toner unit, and the drum unit and reinstall it will work!

I’m happy to help further over the phone at https://www.6ya.com/expert/mustafa_06f84c65ab5cc745

Depending where you are in the world it might be call service
in the user book the trouble shooting section
just about every fault shown says call service
hand book ..68 pages
trouble shooting starts at 47
http://www.kyoceradocumentsolutions.com.sg/dl/wp-content/uploads/2014/11/FS-2000D_BOG_ENG_1.3.pdf