Android process media has stopped!!!!

This happens to me also. the problem is that i cannot use my phone anymore. Every time i open the phone the "android process media has stopped" keeps on popping out. Then the next thing i'll do is to press the ok button. After that it pops out again. Then doing it or pressing the ok button several times shifts the screen off my phone to black then i can not use it anymore.

What can i do? pls help me

Thanks :crying::crying::crying::crying:

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