title: Unable to create service io.flutter.plugins.firebasemessaging.FlutterFirebaseMessagingService
body: <p>I have integrated my flutter app with firebase messaging and successfully received  notifications and all working fine, but now when i tried to run the project again it shows the error and when i send a notification to the device, it stops.</p>
  <p>the error</p>
  <pre><code>D/AndroidRuntime( 8359): Shutting down VM
  E/AndroidRuntime( 8359): FATAL EXCEPTION: main
  E/AndroidRuntime( 8359): Process: com.tapfy.me, PID: 8359
  E/AndroidRuntime( 8359): java.lang.RuntimeException: Unable to create service io.flutter.plugins.firebasemessaging.FlutterFirebaseMessagingService: java.lang.RuntimeException: PluginRegistrantCallback is not set.
  E/AndroidRuntime( 8359):    at android.app.ActivityThread.handleCreateService(ActivityThread.java:4204)
  E/AndroidRuntime( 8359):    at android.app.ActivityThread.access$1500(ActivityThread.java:237)
  E/AndroidRuntime( 8359):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1932)
  E/AndroidRuntime( 8359):    at android.os.Handler.dispatchMessage(Handler.java:106)
  E/AndroidRuntime( 8359):    at android.os.Looper.loop(Looper.java:223)
  E/AndroidRuntime( 8359):    at android.app.ActivityThread.main(ActivityThread.java:7656)
  E/AndroidRuntime( 8359):    at java.lang.reflect.Method.invoke(Native Method)
  E/AndroidRuntime( 8359):    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
  E/AndroidRuntime( 8359):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)
  E/AndroidRuntime( 8359): Caused by: java.lang.RuntimeException: PluginRegistrantCallback is not set.
  E/AndroidRuntime( 8359):    at io.flutter.plugins.firebasemessaging.FlutterFirebaseMessagingService.startBackgroundIsolate(FlutterFirebaseMessagingService.java:157)
  E/AndroidRuntime( 8359):    at io.flutter.plugins.firebasemessaging.FlutterFirebaseMessagingService.onCreate(FlutterFirebaseMessagingService.java:77)
  E/AndroidRuntime( 8359):    at android.app.ActivityThread.handleCreateService(ActivityThread.java:4192)
  E/AndroidRuntime( 8359):    ... 8 more
  I/Process ( 8359): Sending signal. PID: 8359 SIG: 9
  </code></pre>