"out of memory error" for sprint music player

[loveray]

I bought a 8gb memory card for my blackberry tour, when i put it in my phone i did not format the card. So I formatted it and lost my music, pictures etc. I transfered my media from my computer because I had saved them and now i have everything back. The only problem when i want to listen to a certain song it comes up "Out of memory please restart the application. If this message continued to occur please remove some songs and restart the application". I have about 304 songs. Ive erased about 6 songs already. I had a total free space of 7.3 gb. I still have 6.2gb. Please help