Speech to text error - Swift 4 - ios

Question

I am working on an app to convert the speech to text, for some reasons am getting the following error.
Utility] +[AFAggregator logDictationFailedWithError:] Error Domain=kAFAssistantErrorDomain Code=203 "Corrupt" UserInfo={NSLocalizedDescription=Corrupt, NSUnderlyingError=0x60c000253c50 {Error Domain=SiriSpeechErrorDomain Code=102 "(null)"}}
Please find the below code.
import Foundation
import Speech
protocol SpeechManagerDelegate {
func didReceiveText(text:String)
func didStartedListening(status:Bool)
}
class SpeechManager {
lazy var speechSynthesizer = AVSpeechSynthesizer()
let audioEngine = AVAudioEngine()
let speechRecognizer: SFSpeechRecognizer? = SFSpeechRecognizer()
var request = SFSpeechAudioBufferRecognitionRequest()
var recognitionTask: SFSpeechRecognitionTask?
let audioSession = AVAudioSession.sharedInstance()
var delegate:SpeechManagerDelegate?
static let shared:SpeechManager = {
let instance = SpeechManager()
return instance
}()
func startRecording() {
if recognitionTask != nil {
recognitionTask?.cancel()
recognitionTask = nil
}
do {
try audioSession.setCategory(AVAudioSessionCategoryRecord)
try audioSession.setMode(AVAudioSessionModeMeasurement)
try audioSession.setActive(true, with: .notifyOthersOnDeactivation)
} catch {
print("audioSession properties weren't set because of an error.")
}
request = SFSpeechAudioBufferRecognitionRequest()
guard let inputNode = audioEngine.inputNode as? AVAudioInputNode else {
fatalError("Audio engine has no input node")
}
guard let recognitionRequest = request as? SFSpeechAudioBufferRecognitionRequest else {
fatalError("Unable to create an SFSpeechAudioBufferRecognitionRequest object")
}
recognitionRequest.shouldReportPartialResults = true
recognitionTask = speechRecognizer?.recognitionTask(with: recognitionRequest, resultHandler: { (result, error) in
var isFinal = false
if result != nil {
self.delegate?.didReceiveText(text: (result?.bestTranscription.formattedString)!)
isFinal = (result?.isFinal)!
}
if error != nil || isFinal {
self.audioEngine.stop()
inputNode.removeTap(onBus: 0)
}
})
let recordingFormat = inputNode.outputFormat(forBus: 0)
inputNode.installTap(onBus: 0, bufferSize: 1024, format: recordingFormat) { (buffer, when) in
self.request.append(buffer)
}
audioEngine.prepare()
do {
try audioEngine.start()
} catch {
print("audioEngine couldn't start because of an error.")
}
delegate?.didStartedListening(status: true)
}
func stopRecording() {
if audioEngine.isRunning {
audioEngine.stop()
request.endAudio()
audioEngine.inputNode.removeTap(onBus: 0)
}
}
func keepRecording() {
if audioEngine.isRunning {
return
} else {
startRecording()
}
}
func isRecoding() -> Bool {
if audioEngine.isRunning {
return true
} else {
return false
}
}
func speak(text: String) {
do {
try audioSession.setCategory(AVAudioSessionCategoryPlayback)
try audioSession.setMode(AVAudioSessionModeMeasurement)
try audioSession.setActive(true, with: .notifyOthersOnDeactivation)
} catch {
print("audioSession properties weren't set because of an error.")
}
let speechUtterance = AVSpeechUtterance(string: text)
speechSynthesizer.speak(speechUtterance)
}
}
recognitonTask result returns nil. Any help appreciate.