[HELP] GUI not showing up as they should be in the C# script

please help me anyone, any help would be appreciated the gui layout, label and buttons are not showing up when i add the script to the main camera.

using UnityEngine; using System; using System.Collections;

public class Example : MonoBehaviour {

 private string [] LocalizedStrings;
 
 private static TTSBridge ttsengine;
 
 public Font unicodearial;

 string thetext = "Awesome dude! Input a phrase to speech.\n You can use enter to make a new line.\nTry something!";
 int retval;
 string deviceLanguage ="";
 string TTSLanguage ="";
 //string TTSLanguages="";
 
 float thepitch = 1.0f;
 float oldpitch = 1.0f;
 float therate = 1.0f;
 float oldrate = 1.0f;    
 
 
 #if UNITY_ANDROID
 void Start () {
     
     AndroidJNI.AttachCurrentThread();        

     // Retrieve device current language
     using (AndroidJavaClass cls = new AndroidJavaClass("java.util.Locale")) {
         using (AndroidJavaObject locale = cls.CallStatic<AndroidJavaObject>("getDefault")) {                
             deviceLanguage = locale.Call<string>("getDisplayLanguage");
         }
     }        
     // Startup vibration Java object
     ttsengine = new TTSBridge();
     ttsengine.Init();

     
 }
 #endif
 void OnGUI() {
     
     GUI.color = Color.white;
      GUI.skin.font = unicodearial;
     GUILayout.BeginArea(new Rect(20, 10, Screen.width-40, Screen.height-80));
     GUILayout.Label("Android Native TTS engine plugin example demo");
     GUILayout.Space(10.0f);            
     GUILayout.Label("device language:"+deviceLanguage);
     GUILayout.Space(10.0f);
     GUILayout.Label("TTS engine language:"+TTSLanguage);
     
     if(ttsengine.isInitialized())
         TTSLanguage = ttsengine.GetLanguage();
     
     if(GUILayout.Button("Switch to english", GUILayout.Height(40)))
     {

if UNITY_ANDROID

        retval = ttsengine.SetLanguage("inglese");
         Debug.Log( "setLanguage(US) returned: "+retval);

endif

    }
     GUILayout.Space(10.0f);
     if(GUILayout.Button("Switch to "+deviceLanguage+"(default)", GUILayout.Height(40)))
     {

if UNITY_ANDROID

        retval=ttsengine.SetLanguage("italiano");
         Debug.Log( "setLanguage(ITA) returned: "+retval);

endif

    }
     
     GUILayout.Space(40.0f);

     GUILayout.Label("Set pitch: "+thepitch);
     thepitch = GUILayout.HorizontalSlider(thepitch,0.1f,2.0f, GUILayout.Height(50));
     if (thepitch!=oldpitch)
     {
         oldpitch=thepitch;

if UNITY_ANDROID

        ttsengine.SetPitch(thepitch);

endif

    }
     
     
     GUILayout.Space(30.0f);
     GUILayout.Label("Set speed: "+therate);
     therate = GUILayout.HorizontalSlider(therate,0.5f,2.0f, GUILayout.Height(50));
     if (therate!=oldrate)
     {
         oldrate=therate;

if UNITY_ANDROID

        retval=ttsengine.SetSpeechRate(therate);

endif

    }

     GUILayout.Space(20.0f);
     
     thetext = GUILayout.TextArea( thetext, 200 );
     GUILayout.Space(20.0f);
     if(GUILayout.Button("TALK", GUILayout.Height(80)))
     {
         // talk

if UNITY_ANDROID

        ttsengine.Speak(thetext.ToLower());

endif

    }
     GUILayout.Space(30.0f);
     GUILayout.EndArea();
     GUI.Label(new Rect(0,Screen.height-40,Screen.width,40),"Litobyte Softworks - Native TTS engine plugin v 1.1.0");
     
 }
 
 void OnApplicationQuit()
 {
     ttsengine.Dispose();
 }

}

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