I just recently purchased a 1999 Pontiac Grand Prix SE with a cd player unit. It's not the unit with the equalizer, just with the bass and trebel adjustments. Everytime I try to play a CD, the disc pops out and the CD player tells me that I have an error code of "E 20". I tried to put in a cleaning disc, but the same thing happened. I even took an air can and sprayed the inside of the player, but it still doesn't work. What could be the problem?

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