Fixing error AudioPlayer - ios

Question

I'm getting an error in the line of var filePathUrl. The error code is "Value of optional type 'String?' not unwrapped: did you mean to use '!' or '?'?'". How can I fix this error?
import UIKit
import AVFoundation
class PlayMusicViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
var daten = NSBundle.mainBundle().pathForResource("Kool_Savas_Auge", ofType: "mp3")
var filePathUrl = NSURL.fileURLWithPath(daten)
var audioPlayer = AVAudioPlayer(contentsOfURL: filePathUrl, fileTypeHint: nil)
}
#IBAction func PlayMusic(sender: UIButton) {
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
/*
// MARK: - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
// Get the new view controller using segue.destinationViewController.
// Pass the selected object to the new view controller.
}
*/
}

Answer 1

try with
var filePathUrl = NSURL.fileURLWithPath(daten!)
Could you please tell me what I did wrong?
an exclamation mark (!) after an optional value to force the unwrapping of its value . please check this one
Swift 2: !, ? -" Value of optional type "..." not unwrapped"
UPDATE :
for example :
var daten = NSBundle.mainBundle().pathForResource("Kool_Savas_Auge", ofType: "mp3")
var filePathUrl = NSURL.fileURLWithPath(daten!)
do{
var audioPlayer = try AVAudioPlayer(contentsOfURL: filePathUrl, fileTypeHint: nil)
audioPlayer.prepareToPlay()
audioPlayer.play()
}
catch let err as NSError{
print(err.debugDescription);
}