I have pioneer deh 1750 get error 12 what is that

SOURCE: I have a pioneer deh-p6600 head unit and when I

Error codes 12 and 17 are for a dirty or scratched disc. First thing to try would be a different disc. If this does not work most higher-end pioneer head units have a software reset button which is not well marked but usually located behind the face plate and you can use a pen or a pin to push this. It needs to be held down for a few seconds and this will reset all of the settings to factory standard. This does mean that you will lose all saved radio stations, clock settings, audio settings etc. If it still wont play any discs after that it will likely need more detailed attention from a technician. Cheers, Dan

SOURCE: wot does error 12 mean on my pioneer DEH-1400

man i get the same error but um sure its not clean disk!! i think its about the extension of the songs on disk!! what should they be?