导入AudioKit框架后,我在ViewController中添加了几行代码,如下所示：

import UIKit
import AudioKit

class ViewController: UIViewController {

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view,typically from a nib.
    let oscillator = AKOscillator()
    oscillator.amplitude = 0.1
    AudioKit.output = oscillator
    oscillator.start()
}

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


}

运行代码后,我得到59错误,如下图所示.你是如何解决的？