Problem with mp3 file

[Assassin]

theres still 300+ mb left on the player, and that one song is the only one giving me trouble. And the names no the same as any other file either. Theres just something about that song. like i said, i tried 2 different versions and both gave me the same error.

Edit: ok nvm. that song is not the only one. i can't seem to add any other file either. same message. dunno why.