can't get url to work in swift

Question

var url :NSURL = NSURL(fileURLWithPath: NSBundle.mainBundle().pathForResource("MTNSoundTrack", ofType: "aif")!)!

The name of my file and the type are double checked, but still it does not work I'm trying to play a background song in swift spriteKit

Answer 1

The problem was that the sound was not part of the target so i simply added it

i took this post as a reference: Adding files to separate targets in Xcode 4