title: Firebase Cloud Messaging -> Illegal State Exception in Android
body: <p>I am trying to make an app based on Cordova that is able to send Notifications via FireBase Cloud Messaging </p>
  
  <p>Here the MainActivity.java</p>
  
  <pre><code>  public class MainActivity extends CordovaActivity
  {
  
  @Override
  public void onCreate(Bundle savedInstanceState)
  {
      Intent i=new Intent(this,NotificationService.class);
      startService(i);
      super.onCreate(savedInstanceState);
      // Set by &lt;content src="index.html" /&gt; in config.xml
      Helper mhelper=new Helper(this,appView);
          FirebaseMessaging.getInstance().subscribeToTopic("Testing");
          Log.d("Message","Subscribed To Testing");
  
  
      Log.d("Token",FirebaseInstanceId.getInstance().getToken());
      loadUrl(launchUrl);
  
  
  }
  }
  </code></pre>
  
  <p>However I am getting a Illegal State Exception at Line 49:</p>
  
  <pre><code>    FirebaseMessaging.getInstance().subscribeToTopic("Testing");
  </code></pre>
  
  <p>The rest Manifest.xml etc. are the same as the sample provided here
  <a href="https://github.com/firebase/quickstart-android/tree/master/messaging" rel="nofollow noreferrer">https://github.com/firebase/quickstart-android/tree/master/messaging</a></p>
  
  <p>In the Logcat, the error it is showing is::</p>
  
  <pre><code> FATAL EXCEPTION: main
                                                                     Process: careerage.jobseeker.app, PID: 5764
                                                                     java.lang.RuntimeException: Unable to start activity ComponentInfo{careerage.jobseeker.app/careerage.jobseeker.app.MainActivity}: java.lang.IllegalStateException: FirebaseApp with name [DEFAULT] doesn't exist. 
                                                                         at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
                                                                         at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
                                                                         at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:3738)
                                                                         at android.app.ActivityThread.access$900(ActivityThread.java:135)
                                                                         at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1202)
                                                                         at android.os.Handler.dispatchMessage(Handler.java:102)
                                                                         at android.os.Looper.loop(Looper.java:136)
                                                                         at android.app.ActivityThread.main(ActivityThread.java:5017)
                                                                         at java.lang.reflect.Method.invokeNative(Native Method)
                                                                         at java.lang.reflect.Method.invoke(Method.java:515)
                                                                         at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
                                                                         at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
                                                                         at dalvik.system.NativeStart.main(Native Method)
                                                                      Caused by: java.lang.IllegalStateException: FirebaseApp with name [DEFAULT] doesn't exist. 
                                                                         at com.google.firebase.FirebaseApp.getInstance(Unknown Source)
                                                                         at com.google.firebase.FirebaseApp.getInstance(Unknown Source)
                                                                         at com.google.firebase.iid.FirebaseInstanceId.getInstance(Unknown Source)
                                                                         at com.google.firebase.messaging.FirebaseMessaging.getInstance(Unknown Source)
                                                                         at careerage.jobseeker.app.MainActivity$override.onCreate(MainActivity.java:49)
                                                                         at careerage.jobseeker.app.MainActivity$override.access$dispatch(MainActivity.java)
                                                                         at careerage.jobseeker.app.MainActivity.onCreate(MainActivity.java:0)
                                                                         at android.app.Activity.performCreate(Activity.java:5231)
                                                                         at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
                                                                         at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
                                                                         at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245) 
                                                                         at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:3738) 
                                                                         at android.app.ActivityThread.access$900(ActivityThread.java:135) 
                                                                         at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1202) 
                                                                         at android.os.Handler.dispatchMessage(Handler.java:102) 
                                                                         at android.os.Looper.loop(Looper.java:136) 
                                                                         at android.app.ActivityThread.main(ActivityThread.java:5017) 
                                                                         at java.lang.reflect.Method.invokeNative(Native Method) 
                                                                         at java.lang.reflect.Method.invoke(Method.java:515) 
                                                                         at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779) 
                                                                         at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595) 
                                                                         at dalvik.system.NativeStart.main(Native Method) 
  </code></pre>
  
  <p>I tried <a href="https://stackoverflow.com/questions/37346363/java-lang-illegalstateexception-firebaseapp-with-name-default">java.lang.IllegalStateException: FirebaseApp with name [DEFAULT]</a>
   but still it doesn't recognize FirebaseDatabase Class</p>