title: How to add voice commands to an HoloLens 2 App in Unity?
body: <p>We are creating a <strong>UWP</strong> app in <strong>Unity</strong>. We are using the <strong>MRTK</strong>. I want to add <strong>voice commands</strong>. If I say "<em>turn the cube blue</em>" it should turn the cube blue itself.</p>
  
  <p>Here is what I tried:
  Create Empty -> Add the script '<em>Speech Input Source</em>' -> Create a Keyword called "<em>Turn the cube blue</em>" -> Add the script Speech Input Handler -> Put the Keyword "<em>Turn the cube blue</em>" in and get my Cube in the Response () and using my turn blue script. </p>
  
  <p>Now when I say my Keyword, a error pops up.</p>
  
  <pre><code>NullReferenceException: Object reference not set to an instance of an object 
  </code></pre>
  
  <p>When i open that error it gives me this code:</p>
  
  <pre><code>InputManager.Instance.RaiseSpeechKeywordPhraseRecognized(this, 0, confidence, phraseDuration, phraseStartTime, semanticMeanings, text);
  </code></pre>
  
  <p>in the <strong>SpeechInputSource</strong> script.</p>