Swift3 语音识别给出错误swift error domain=nsosstatuserrordomain代码=2003334207“；（无效）“；

我试图在视图控制器中使用语音识别 我为同一个错误编写了以下代码：

swift error domain=nsosstatuserrordomain code=2003334207 "(null)"

我还使用file.m4a在根目录中创建了一个音频文件，但在下面的第2行之后出现了零错误，代码如下：

case .authorized:
                isButtonEnabled = true
                do{
                    Linenumber = "1"
                let path = Bundle.main.url(forResource: "File", withExtension: "m4a")
                Linenumber = "2"

                    let sound = try AVAudioPlayer(contentsOf: path!)
                    Linenumber = "3"
                    self.audioPlayer = sound
                    Linenumber = "4"
                    self.audioPlayer.delegate = self
                    Linenumber = "5"
                    sound.play()
                    let recognizer = SFSpeechRecognizer()
                    Linenumber = "6"
                    let request = SFSpeechURLRecognitionRequest(
                        url: path!)
                    Linenumber = "7"
                    recognizer?.recognitionTask(with: request, resultHandler: {
                        (result, error) in
                        Linenumber = "8"
                        self.meetingnotes.text = self.meetingnotes.text + " " + (result?.bestTranscription.formattedString)!
                    })
                }

请告诉我哪里出了问题。 另外，我已经在Info.plist中创建了一个条目 谢谢