title: My app crashed everytime I send notification from Firebase Cloud Messaging
body: <p>I want to send notification from FCM to my device, but my app always stopped working every time I send a notification. What could be the problem?</p>
  
  <p>Here's some of my code</p>
  
  <pre><code>// app-level build.gradle
  dependencies {
      testImplementation 'junit:junit:4.12'
      androidTestImplementation 'com.android.support.test:runner:1.0.2'
      androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
      implementation 'com.google.firebase:firebase-core:16.0.9'
      implementation 'com.android.support:multidex:1.0.3'
      implementation 'com.android.support:design:27.1.0'
      implementation 'com.google.firebase:firebase-messaging:17.3.3'
  }
  </code></pre>
  
  <p>// project-level build.gradle</p>
  
  <pre><code>dependencies {
      classpath 'com.android.tools.build:gradle:3.3.1'
      classpath 'com.google.gms:google-services:4.2.0'
  }
  </code></pre>
  
  <p>AndroidManifest.xml</p>
  
  <pre><code>&lt;intent-filter&gt;
      &lt;action android:name="FLUTTER_NOTIFICATION_CLICK"/&gt;
      &lt;category android:name="android.intent.category.DEFAULT"/&gt;
  &lt;/intent-filter&gt;
  </code></pre>
  
  <p>pubspec.yaml</p>
  
  <pre><code>dependencies:
    flutter:
      sdk: flutter
    cloud_firestore:
    firebase_core: 
    firebase_messaging: 
    cupertino_icons: ^0.1.2
  
  dev_dependencies:
  </code></pre>
  
  <p>error log:</p>
  
  <pre><code>E/AndroidRuntime(17164): java.lang.RuntimeException: Unable to instantiate service io.flutter.plugins.firebasemessaging.FlutterFirebaseMessagingService: java.lang.ClassNotFoundException: Didn't find class "io.flutter.plugins.firebasemessaging.FlutterFirebaseMessagingService" on path: DexPathList[[zip file "/data/app/com.maztur.hunafa-z3QygagDkOlt4fQ6fzLBgw==/base.apk"],nativeLibraryDirectories=[/data/app/com.maztur.hunafa-z3QygagDkOlt4fQ6fzLBgw==/lib/arm64, /data/app/com.maztur.hunafa-z3QygagDkOlt4fQ6fzLBgw==/base.apk!/lib/arm64-v8a, /system/lib64, /system/vendor/lib64]]
  E/AndroidRuntime(17164):    at android.app.ActivityThread.handleCreateService(ActivityThread.java:3737)
  E/AndroidRuntime(17164):    at android.app.ActivityThread.access$1400(ActivityThread.java:237)
  E/AndroidRuntime(17164):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1801)
  E/AndroidRuntime(17164):    at android.os.Handler.dispatchMessage(Handler.java:106)
  E/AndroidRuntime(17164):    at android.os.Looper.loop(Looper.java:214)
  E/AndroidRuntime(17164):    at android.app.ActivityThread.main(ActivityThread.java:7045)
  E/AndroidRuntime(17164):    at java.lang.reflect.Method.invoke(Native Method)
  E/AndroidRuntime(17164):    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
  E/AndroidRuntime(17164):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:964)
  E/AndroidRuntime(17164): Caused by: java.lang.ClassNotFoundException: Didn't find class "io.flutter.plugins.firebasemessaging.FlutterFirebaseMessagingService" on path: DexPathList[[zip file "/data/app/com.maztur.hunafa-z3QygagDkOlt4fQ6fzLBgw==/base.apk"],nativeLibraryDirectories=[/data/app/com.maztur.hunafa-z3QygagDkOlt4fQ6fzLBgw==/lib/arm64, /data/app/com.maztur.hunafa-z3QygagDkOlt4fQ6fzLBgw==/base.apk!/lib/arm64-v8a, /system/lib64, /system/vendor/lib64]]
  E/AndroidRuntime(17164):    at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:134)
  E/AndroidRuntime(17164):    at java.lang.ClassLoader.loadClass(ClassLoader.java:379)
  E/AndroidRuntime(17164):    at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
  E/AndroidRuntime(17164):    at android.app.AppComponentFactory.instantiateService(AppComponentFactory.java:103)
  E/AndroidRuntime(17164):    at android.app.ActivityThread.handleCreateService(ActivityThread.java:3732)
  E/AndroidRuntime(17164):    ... 8 more
  E/AndroidRuntime(17164):    Suppressed: java.lang.NoClassDefFoundError: Failed resolution of: Lcom/google/firebase/messaging/FirebaseMessagingService;
  E/AndroidRuntime(17164):        at java.lang.VMClassLoader.findLoadedClass(Native Method)
  E/AndroidRuntime(17164):        at java.lang.ClassLoader.findLoadedClass(ClassLoader.java:738)
  E/AndroidRuntime(17164):        at java.lang.ClassLoader.loadClass(ClassLoader.java:363)
  E/AndroidRuntime(17164):        ... 11 more
  E/AndroidRuntime(17164):    Caused by: java.lang.ClassNotFoundException: com.google.firebase.messaging.FirebaseMessagingService
  E/AndroidRuntime(17164):        at java.lang.VMClassLoader.findLoadedClass(Native Method)
  E/AndroidRuntime(17164):        at java.lang.ClassLoader.findLoadedClass(ClassLoader.java:738)
  E/AndroidRuntime(17164):        at java.lang.ClassLoader.loadClass(ClassLoader.java:363)
  E/AndroidRuntime(17164):        at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
  E/AndroidRuntime(17164):        ... 14 more
  E/AndroidRuntime(17164):    Caused by: java.lang.IllegalAccessError: Class com.google.firebase.iid.zzb extended by class com.google.firebase.messaging.FirebaseMessagingService is inaccessible (declaration of 'com.google.firebase.messaging.FirebaseMessagingService' appears in /data/app/com.maztur.hunafa-z3QygagDkOlt4fQ6fzLBgw==/base.apk!classes2.dex)
  E/AndroidRuntime(17164):        ... 14 more
  I/Process (17164): Sending signal. PID: 17164 SIG: 9
  Lost connection to device.
  </code></pre>