App Review Ezmp3 Pro

I bought the pro version on iPhone and it seems to be working fine.

I wanted to put the same app on my iPod touch 6
but it is not working, I am unable to get songs from my own library on my iPod device. Have tried to purchase again but get message saying you already purchased this app. Tried to reinstall/ delete/reinstall but no luck.

WildUnderdog about EZMP3 Player Pro