Car cd player will not read cds!

i have a fairly old cd player in my 96 nissan altima. its a sony xplod 50wx4. it used to work fine but now when i put a cd in it it doesnt read the disc at all. it just flashes error across the screen. any simple way i can fix it without spending too much?

Cleaning disk?

The lens could be dirty. If not, it may have died on you and you might have to get a new stereo deck.

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