deedee

Hello I'm new. Hope I'm in the right place. I just bought a used avic d3. I hope my dvd player works. I keep on getting an error message that says "reading error". I have put in about 5 original dvd and so far no luck with it. The cd player works fine. I even tried going into both av1 and av2 and so far not lucky. What am I doing wrong? Do you guys have any instructions or tips for me. Thanks.