Please help!! my tracks wont play in Djay 2

none of my music will play in the Djay app. I have all my tracks in my music folder on my Kindle fire HD 7 (4th gen)… The music will play if i want to listen to it through my music app on the device, but when i try to load a track in the Djay app nothing loads or plays and the waveform at the top of the deck just shows a flat line. The track name and artist are visible when i try to load a track but i get no audio. Can anyone help please??