GCM关闭活动的活动

我是一位Google云端消息传送的初学者。我正在开发一个演示应用程序来检查GCm的功能。我创建了一个GCM项目，我正在检查设备是否已注册。我使用下面的代码，GCM关闭活动的活动

public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 
     GCMRegistrar.checkDevice(this); 
     GCMRegistrar.checkManifest(this); 
     final String regId = GCMRegistrar.getRegistrationId(this); 
     if (regId.equals("")) { 
      GCMRegistrar.register(this, "483910217912"); 
      Log.d(tag, "Registered"); 
     } else { 
      Log.v(tag, "Already registered"); 
     } 
    }

和我的清单文件，

<uses-sdk android:minSdkVersion="8" /> 
    <!-- App receives GCM messages. --> 
<uses-permission android:name="com.google.android.c2dm.permission.RECEIVE" /> 
<!-- GCM connects to Google Services. --> 
<uses-permission android:name="android.permission.INTERNET" /> 
<!-- GCM requires a Google account. --> 
<uses-permission android:name="android.permission.GET_ACCOUNTS" /> 
<!-- Keeps the processor from sleeping when a message is received. --> 
<uses-permission android:name="android.permission.WAKE_LOCK" /> 
<permission android:name="my_app_package.permission.C2D_MESSAGE" android:protectionLevel="signature" /> 
<uses-permission android:name="my_app_package.permission.C2D_MESSAGE" /> 

    <application 
     android:icon="@drawable/ic_launcher" 
     android:label="@string/app_name" > 
     <receiver android:name="com.google.android.gcm.GCMBroadcastReceiver" android:permission="com.google.android.c2dm.permission.SEND" > 
    <intent-filter> 
    <action android:name="com.google.android.c2dm.intent.RECEIVE" /> 
    <action android:name="com.google.android.c2dm.intent.REGISTRATION" /> 
    <category android:name="my_app_package" /> 
    </intent-filter> 
</receiver> 
<service android:name=".GCMIntentService" /> 
     <activity 
      android:name=".GCmExampleActivity" 
      android:label="@string/app_name" > 
      <intent-filter> 
       <action android:name="android.intent.action.MAIN" /> 

       <category android:name="android.intent.category.LAUNCHER" /> 
      </intent-filter> 
     </activity> 
    </application>

我已经包括GSM jar文件到我的项目。

的logcat的错误它给是，

10-11 13:44:59.001: E/AndroidRuntime(339): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.kochar.it.GCM/com.kochar.it.GCM.GCmExampleActivity}: java.lang.UnsupportedOperationException: Device does not have package com.google.android.gsf

的错误就行了，