title: couldn't run Google Maps Android API Utility Demo
body: <p>i'm having problems to run the Google Maps Android API Utility Demo, it shows this error:  </p>
  
  <pre><code>04-03 16:32:37.397: E/dalvikvm(2592): Could not find class 'com.google.maps.android.utils.demo.ClusteringDemoActivity', referenced from method com.google.maps.android.utils.demo.MainActivity.onCreate
      04-03 16:32:37.452: E/AndroidRuntime(2592): FATAL EXCEPTION: main
      04-03 16:32:37.452: E/AndroidRuntime(2592): java.lang.NoClassDefFoundError: com.google.maps.android.utils.demo.ClusteringDemoActivity
      04-03 16:32:37.452: E/AndroidRuntime(2592):     at com.google.maps.android.utils.demo.MainActivity.onCreate(MainActivity.java:20)
      04-03 16:32:37.452: E/AndroidRuntime(2592):     at android.app.Activity.performCreate(Activity.java:5163)
      04-03 16:32:37.452: E/AndroidRuntime(2592):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1094)
      04-03 16:32:37.452: E/AndroidRuntime(2592):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2061)
      04-03 16:32:37.452: E/AndroidRuntime(2592):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2122)
      04-03 16:32:37.452: E/AndroidRuntime(2592):     at android.app.ActivityThread.access$600(ActivityThread.java:140)
      04-03 16:32:37.452: E/AndroidRuntime(2592):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1228)
      04-03 16:32:37.452: E/AndroidRuntime(2592):     at android.os.Handler.dispatchMessage(Handler.java:99)
      04-03 16:32:37.452: E/AndroidRuntime(2592):     at android.os.Looper.loop(Looper.java:137)
      04-03 16:32:37.452: E/AndroidRuntime(2592):     at android.app.ActivityThread.main(ActivityThread.java:4895)
      04-03 16:32:37.452: E/AndroidRuntime(2592):     at java.lang.reflect.Method.invokeNative(Native Method)
      04-03 16:32:37.452: E/AndroidRuntime(2592):     at java.lang.reflect.Method.invoke(Method.java:511)
      04-03 16:32:37.452: E/AndroidRuntime(2592):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:994)
      04-03 16:32:37.452: E/AndroidRuntime(2592):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:761)
      04-03 16:32:37.452: E/AndroidRuntime(2592):     at dalvik.system.NativeStart.main(Native Method)
  </code></pre>
  
  <p>although i followed the steps shown in the installation demo, and the class <strong>ClusteringDemoActivity</strong> exists in the package.</p>