Why am I getting a list index out of range error for Watson Speech to Text

Questions & Answers
1

I’m getting a list index out of range error for speech to text with the new Watson sdk. The weird thing is that it only occurs with the japanese models. I can change the model to chinese and english and I don’t get the error. The only code I have changed from the ExampleStreaming.cs file is the following:

 public bool Active
    {
        get { return _speechToText.IsListening; }
        set
        {
            if (value && !_speechToText.IsListening)
            {

				//_speechToText.RecognizeModel = "zh-CN_BroadbandModel";
				//_speechToText.RecognizeModel = "en-US_BroadbandModel";
				_speechToText.RecognizeModel = "ja-JP_BroadbandModel";
                _speechToText.DetectSilence = true;
                _speechToText.EnableWordConfidence = true;
                _speechToText.EnableTimestamps = true;
                _speechToText.SilenceThreshold = 0.01f;
                _speechToText.MaxAlternatives = 0;
                _speechToText.EnableInterimResults = true;
                _speechToText.OnError = OnError;
                _speechToText.InactivityTimeout = -1;
                _speechToText.ProfanityFilter = false;
                _speechToText.SmartFormatting = true;
                _speechToText.SpeakerLabels = false;
                _speechToText.WordAlternativesThreshold = null;
                _speechToText.StartListening(OnRecognize, OnRecognizeSpeaker);
            }
            else if (!value && _speechToText.IsListening)
            {
                _speechToText.StopListening();
            }
        }
    }

Here is the error:
[02/26/2018 01:23:03][SpeechToText.OnListenMessage()][ERROR] Error: list index out of range
UnityEngine.Debug:LogError(Object)
IBM.Watson.DeveloperCloud.Debug.DebugReactor:ProcessLog(LogRecord) (at Assets/Watson/Scripts/Debug/DebugReactor.cs:60)
IBM.Watson.DeveloperCloud.Logging.LogSystem:ProcessLog(LogRecord) (at Assets/Watson/Scripts/Logging/Logger.cs:196)
IBM.Watson.DeveloperCloud.Logging.Log:Error(String, String, Object) (at Assets/Watson/Scripts/Logging/Logger.cs:261)
IBM.Watson.DeveloperCloud.Services.SpeechToText.v1.SpeechToText:OnListenMessage(Message) (at Assets/Watson/Scripts/Services/SpeechToText/v1/SpeechToText.cs:789)
IBM.Watson.DeveloperCloud.Connection.c__Iterator0:MoveNext() (at Assets/Watson/Scripts/Connection/WSConnector.cs:286)
IBM.Watson.DeveloperCloud.Utilities.Routine:MoveNext() (at Assets/Watson/Scripts/Utilities/Runnable.cs:128)
UnityEngine.SetupCoroutine:InvokeMoveNext(IEnumerator, IntPtr)

2

I have the same problem with spanish (es-ES_BroadbandModel). Any help?

3

I have the same problem with ja-JP_BroadbandModel. Anyone know?

4

Same exact issue. Here’s where mine pops up

Line 791 of SpeechToText.cs

else if (json.Contains("error"))
                    {
                        string error = (string)json["error"];
                        Log.Error("SpeechToText.OnListenMessage()", "Error: {0}", error);
                        StopListening();
                        if (OnError != null)
                            OnError(error);
                    }

And here’s an image of my inspection of json when I hit my breakpoints, it says “Children could not be evaluated”

113314-error.png
113314-error.png1446×113 18.5 KB

Edit#2
Providing keywords to _speechToText.Keywords in the ExampleStreaming.cs seems to resolve this issue.

However it does occur if no keywords are provided. So still a bug, but this should allow you work around it for now.

5

This should have been cleared up with the latest SDK version in the asset store. Can you download the newest version and try again?