Error : Neither user 10066 nor current process has android.permission.BACKUP
===

I am developing an android application for which i was studying about Google Backup API ,
i read this tutorial 
http://www.edumobile.org/android/android-development/backup-manager/

and tried to implement it but it is crashing all the time 

The Logcat is


    07-31 13:39:35.797: E/AndroidRuntime(18279): FATAL EXCEPTION: main
    07-31 13:39:35.797: E/AndroidRuntime(18279): java.lang.IllegalStateException: Could not execute method of the activity
    07-31 13:39:35.797: E/AndroidRuntime(18279): 	at android.view.View$1.onClick(View.java:2072)
    07-31 13:39:35.797: E/AndroidRuntime(18279): 	at android.view.View.performClick(View.java:2408)
    07-31 13:39:35.797: E/AndroidRuntime(18279): 	at android.view.View$PerformClick.run(View.java:8816)
    07-31 13:39:35.797: E/AndroidRuntime(18279): 	at android.os.Handler.handleCallback(Handler.java:587)
    07-31 13:39:35.797: E/AndroidRuntime(18279): 	at android.os.Handler.dispatchMessage(Handler.java:92)
    07-31 13:39:35.797: E/AndroidRuntime(18279): 	at android.os.Looper.loop(Looper.java:123)
    07-31 13:39:35.797: E/AndroidRuntime(18279): 	at android.app.ActivityThread.main(ActivityThread.java:4633)
    07-31 13:39:35.797: E/AndroidRuntime(18279): 	at java.lang.reflect.Method.invokeNative(Native Method)
    07-31 13:39:35.797: E/AndroidRuntime(18279): 	at java.lang.reflect.Method.invoke(Method.java:521)
    07-31 13:39:35.797: E/AndroidRuntime(18279): 	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:858)
    07-31 13:39:35.797: E/AndroidRuntime(18279): 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
    07-31 13:39:35.797: E/AndroidRuntime(18279): 	at dalvik.system.NativeStart.main(Native Method)
    07-31 13:39:35.797: E/AndroidRuntime(18279): Caused by: java.lang.reflect.InvocationTargetException
    07-31 13:39:35.797: E/AndroidRuntime(18279): 	at com.pref.BackupManagerExample.onRestoreButtonClick(BackupManagerExample.java:164)
    07-31 13:39:35.797: E/AndroidRuntime(18279): 	at java.lang.reflect.Method.invokeNative(Native Method)
    07-31 13:39:35.797: E/AndroidRuntime(18279): 	at java.lang.reflect.Method.invoke(Method.java:521)
    07-31 13:39:35.797: E/AndroidRuntime(18279): 	at android.view.View$1.onClick(View.java:2067)
    07-31 13:39:35.797: E/AndroidRuntime(18279): 	... 11 more
    07-31 13:39:35.797: E/AndroidRuntime(18279): Caused by: java.lang.SecurityException: getCurrentTransport: Neither user 10066 nor current process has android.permission.BACKUP.
    07-31 13:39:35.797: E/AndroidRuntime(18279): 	at android.os.Parcel.readException(Parcel.java:1247)
    07-31 13:39:35.797: E/AndroidRuntime(18279): 	at android.os.Parcel.readException(Parcel.java:1235)
    07-31 13:39:35.797: E/AndroidRuntime(18279): 	at android.app.backup.IBackupManager$Stub$Proxy.getCurrentTransport(IBackupManager.java:444)
    07-31 13:39:35.797: E/AndroidRuntime(18279): 	at android.app.backup.BackupManager.requestRestore(BackupManager.java:141)
    07-31 13:39:35.797: E/AndroidRuntime(18279): 	... 15 more

and the menifest is 

 

       <?xml version="1.0" encoding="utf-8"?>
    <manifest xmlns:android="http://schemas.android.com/apk/res/android"
        package="com.pref"
        android:versionCode="1"
        android:versionName="1.0" >
    
        <uses-sdk android:minSdkVersion="8" />
        <uses-permission android:name="android.permission.INTERNET"/>
      
    <uses-permission android:name="android.permission.BACKUP" />
        <application
            android:icon="@drawable/ic_launcher"
            android:label="@string/app_name" 
             android:theme="@android:style/Theme.NoTitleBar.Fullscreen"
             android:backupAgent="com.pref.BackupManagerExample">
             <activity android:name=".Preff" />
               
            
             
            <activity
                android:name=".PrefrencesActivity"
                android:label="@string/app_name" >
                <intent-filter>
                    <action android:name="android.intent.action.MAIN" />
    
                    <category android:name="android.intent.category.LAUNCHER" />
                    
                </intent-filter>
            </activity>
           
            
             <meta-data android:name="com.google.android.backup.api_key"
        android:value="AEdPqrEAAAAIo8gaMLEy1sb1bVd6Cyqs5dxPAy8qvFzfILeLWB" />
             <activity
                android:name=".BackupManagerExample"
                android:enabled="true"/>
         
        </application>
    
    </manifest>

What could be the cause for this error ? And how can i remove it ?

 