My AudioPlayer is not working. can't understand this

My audioPlayer is not working. I can't seem to understand why. I am a newbie and don't have much experience with swift. When I run, I am getting the println("audioPlayer not created") message. FilePath, FilePathUrl and mp3 have been confirmed and valid.

import UIKit import AVFoundation

class PlaySoundsViewController: UIViewController {

var audioPlayer:AVAudioPlayer!

override func viewDidLoad() {
    super.viewDidLoad()

    // Do any additional setup after loading the view.
    if let filePath = NSBundle.mainBundle().pathForResource("crankringtone", ofType: "mp3"){
        var filePathUrl = NSURL.fileURLWithPath(filePath)

        audioPlayer = AVAudioPlayer(contentsOfURL: filePathUrl, error: nil)
    } else {
        println("file path is empty")
    }
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

@IBAction func playSlowAudio(sender: UIButton) {
    // here you can check if the player was successfully created
    if var audioPlayer = audioPlayer {
        // here you can check if your player is playing
        if audioPlayer.playing {
            //if playing lets pause it
            audioPlayer.pause()
        } else {
            //if plaused lets play it
            audioPlayer.play()
        }

    } else {
        println("audioPlayer not created")
    }
}