Every time i turn on my mp3 it says incorrect
This happens to every MP3 player eventually. You will need to reset it and reformat. Sorry, there is no easy fix. The MP3 system software has crashed for an unknown reason. It happens.
Often, a crash can be caused by static that you, me, or anybody else can even detect or feel. All we can do is reset the device, format it, and install all of our stuff again. I have had this happen to Sansa, IPOD, TVIO, and others. Just walking across a wooden floor can build up a static charge in your body of over 500 volts, and you would never know it. When you hear the crackle of clothes being pulled out of a dryer, or feel the shock from grabbing a doorknob, the charge is in the tens of thousands of volts! It only takes a 50 volt static discharge to disrupt flash memory like that found in a MP3 player, jump drive, cell phone, etc....
Find the RESET button, and after the unit is turned on, hold it in with a paperclip or something similar for 3 seconds. This will return the unit to factory default, and you can reload it with all your stuff.
A good rule of thumb is that before you touch any portable electronic device, touch the biggest piece of metal that is near you, which will drain any static charge in your body. This is purely preventative, and not a fix-all, but it has helped me overall in not having so many problems with my personal portable electronics.
Good Luck, and thank You for using FixYa!