Panasonic SC-HT70 System "getting err message cd player" Questions

err disc massage will apear I have owned insignia dvd players in the past. When I got the "no disc" message I simply cleaned the inside of the machine. To do this you can get an old CD and tape a soft

...err" message appeared on the screen. I can not play the CDs, nor can I remove them. Any suggestions? Thanks, David I saw on another JVC systems manual that its an error message that shows when the ...