About the error that occurs when playing music on Swift.

import UIKit
import AVFoundation

classViewController:UIViewController {

    varplayer —AVAudioPlayer=AVAudioPlayer()

    override func viewDidLoad(){
        super.viewDidLoad()

        let audioPath
            = NSBundle.mainBundle().pathForResource("bomb", ofType:"m4a")!

        do{
            try player
                = AVAudioPlayer (contentsOfURL:NSURL (fileURLWithPath:audioPath))
            player.play()
        } catch{
            // Process error here
        }
    }

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

 fatal error: unexpectedly found nil while unwrapping an optional value
(lldb)