Im having a really anoying buzz problem whwn I play E note on D string! And only on this place! I think it coming from that place exacly. I tried to scrach (I dont know the word) under a little but it didnt help. What to do. please help? 

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. . . finding the source of the anoying buzz could be an issue.
Im pretty sure that the problem is fingerboard. Is it hard to fix by my own, with sandpaper?
A sharp plane is how you remove hills and valleys in the fingerboard. If you try and sand out the bumps, you will just move them to another spot on the fingerboard.