jvc cd player "error 04" & "07" message. Any clarification on those error messages would be appreciated:0)

I have a JVC cd player in my car. It was a x-mas gift and I don't have all the #'s handy. It plays very few cd's. Doesn't matter if they are home made or store bought. I am constantly getting a code "error 4" or "Error 7" what do these mean? Sometimes it will play a certain cd and I will take it out to try another. After I find out it won't play the cd I will put the cd that I just took out 2 min. before and it will give me error 04! I have bought cd lens cleaners & cd cleaners. Any clarification on those error messages would be appreciated:0) Thanks

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