title: Error running Google app engine mobile back end client
body: <p>I am following the tutorial <a href="https://developers.google.com/cloud/samples/mbs/getting_started">Getting started with mobile backend</a>.</p>
  
  <p>However when I try run the downloaded client I get the following exception:</p>
  
  <pre><code>05-23 14:48:49.960: E/AndroidRuntime(15384): FATAL EXCEPTION: main
  05-23 14:48:49.960: E/AndroidRuntime(15384): java.lang.NoClassDefFoundError: com.google.cloud.backend.android.GCMIntentService
  05-23 14:48:49.960: E/AndroidRuntime(15384):    at com.google.cloud.backend.android.CloudBackendAsync.&lt;init&gt;(CloudBackendAsync.java:71)
  05-23 14:48:49.960: E/AndroidRuntime(15384):    at com.google.cloud.backend.android.CloudBackendMessaging.&lt;init&gt;(CloudBackendMessaging.java:47)
  05-23 14:48:49.960: E/AndroidRuntime(15384):    at com.google.cloud.backend.android.CloudBackendActivity.onCreate(CloudBackendActivity.java:75)
  05-23 14:48:49.960: E/AndroidRuntime(15384):    at com.google.cloud.backend.android.sample.guestbook.GuestbookActivity.onCreate(GuestbookActivity.java:60)
  05-23 14:48:49.960: E/AndroidRuntime(15384):    at android.app.Activity.performCreate(Activity.java:5206)
  05-23 14:48:49.960: E/AndroidRuntime(15384):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1083)
  05-23 14:48:49.960: E/AndroidRuntime(15384):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2064)
  05-23 14:48:49.960: E/AndroidRuntime(15384):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2125)
  05-23 14:48:49.960: E/AndroidRuntime(15384):    at android.app.ActivityThread.access$600(ActivityThread.java:140)
  05-23 14:48:49.960: E/AndroidRuntime(15384):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1227)
  05-23 14:48:49.960: E/AndroidRuntime(15384):    at android.os.Handler.dispatchMessage(Handler.java:99)
  05-23 14:48:49.960: E/AndroidRuntime(15384):    at android.os.Looper.loop(Looper.java:137)
  05-23 14:48:49.960: E/AndroidRuntime(15384):    at android.app.ActivityThread.main(ActivityThread.java:4898)
  05-23 14:48:49.960: E/AndroidRuntime(15384):    at java.lang.reflect.Method.invokeNative(Native Method)
  05-23 14:48:49.960: E/AndroidRuntime(15384):    at java.lang.reflect.Method.invoke(Method.java:511)
  05-23 14:48:49.960: E/AndroidRuntime(15384):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1006)
  05-23 14:48:49.960: E/AndroidRuntime(15384):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:773)
  05-23 14:48:49.960: E/AndroidRuntime(15384):    at dalvik.system.NativeStart.main(Native Method)
  </code></pre>
  
  <p>I have no idea why this is happening from the out of the box sample code from Google. Does anyone know how to fix this?</p>
  
  <p>Thanks, Jason</p>