speech animals not run

public class NewBehaviourScript : MonoBehaviour { SpVoice voice = new SpVoiceClass(); SpeechVoiceSpeakFlags SpFlags = SpeechVoiceSpeakFlags.SVSFlagsAsync; public Texture2D[] m_iMouthBmp; string text="I love unity3d."; int i; string VisemeId ="viseme"; public GUISkin myskin ;

 void OnGUI () {
     GUI.skin = myskin;
     GUI.Label(new Rect (20, 20, 120, 50),VisemeId);

     if(GUI.Button (new Rect (20, 60, 120, 50), "speak")) {
         voice.Viseme += new _ISpeechVoiceEvents_VisemeEventHandler(voice_Viseme);
         voice.Speak(text, SpFlags);
         voice.WaitUntilDone(-4);
         renderer.material.mainTexture = m_iMouthBmp[i];
     }
 }

 void voice_Viseme(int StreamNumber, object StreamPosition, int Duration, SpeechVisemeType NextVisemeId, SpeechVisemeFeature Feature, SpeechVisemeType CurrentVisemeId) {
     VisemeId= CurrentVisemeId.ToString().Replace("SP_VISEME_","");

     //VisemeId  = CurrentVisemeId.ToString();
     if(VisemeId == "15"|| VisemeId =="17"||VisemeId =="18"||VisemeId =="21") { 
         i=1; 
     } else { 
         i=0; 
     } 
 }