Getting Error while passing audio file path and request through recognitionTask

Question

I'm trying to implement audio to text,audio is playing well but When RecognitionRequest is passed through recognitionTaskit showing error

:Error is:Error Domain=kAFAssistantErrorDomain Code=1101 "(null)"

and getting null

my code is :

func requestSpeechMethod()
    {
        SFSpeechRecognizer.requestAuthorization {authenticateStatus in

            if authenticateStatus == SFSpeechRecognizerAuthorizationStatus.authorized {
                if let path = Bundle.main.url(forResource: "2", withExtension: "mp3")
                {
                    do {
                        //----------------------------------------
                        let audio = try AVAudioPlayer(contentsOf: path)
                        self.audioPlayer = audio
                        self.audioPlayer.delegate = self
                        audio.play()
                        //----------------------------------------
                    }
                    catch
                         {
                        print("Error")
                    }
                    //----------------------------------------
                    let recognizer = SFSpeechRecognizer()
                    let request = SFSpeechURLRecognitionRequest(url: path)
                    recognizer?.recognitionTask(with: request) { (result,error) in
                        //---------------------
                        if let error = error {
                            print("Error is:\(error)")
                        } else
                           {
                            self.textVOutlet.text = result?.bestTranscription.formattedString
                        }
                        //---------------------
                    }
                }
                   //----------------------------------------
            }
        }
    }