java - The following classes could not be instantiated:com.google.android.gms.ads.AdView(Open Class, Show Error Log) -

this xml file

<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"         xmlns:tools="http://schemas.android.com/tools"         xmlns:ads="http://schemas.android.com/apk/res-auto"         android:id="@+id/linearlayout1"         android:layout_width="match_parent"         android:layout_height="match_parent"         android:orientation="vertical"         android:paddingbottom="@dimen/activity_vertical_margin"         android:paddingleft="@dimen/activity_horizontal_margin"         android:paddingright="@dimen/activity_horizontal_margin"         android:paddingtop="@dimen/activity_vertical_margin"         tools:context="com.example.interadd.mainactivity" >               <com.google.android.gms.ads.adview android:id="@+id/adview"                              android:layout_width="match_parent"                              android:layout_height="wrap_content"                              ads:adsize="banner"                              ads:adunitid="ca-app-pub-2961758853938686/9050318854"/>      </linearlayout> 

this mainfest file

<?xml version="1.0" encoding="utf-8"?> <!doctype xml> <manifest xmlns:android="http://schemas.android.com/apk/res/android"     package="com.example.interadd"     android:versioncode="1"     android:versionname="1.0" >      <uses-permission android:name="android.permission.internet"/> <uses-permission android:name="android.permission.access_network_state"/>      <uses-sdk         android:minsdkversion="8"         android:targetsdkversion="21" />      <application         android:allowbackup="true"         android:icon="@drawable/ic_launcher"         android:label="@string/app_name"         android:theme="@style/apptheme" >         <meta-data android:name="com.google.android.gms.version"            android:value="@integer/google_play_services_version"/>          <activity             android:name=".mainactivity"             android:label="@string/app_name" >             <intent-filter>                 <action android:name="android.intent.action.main" />                  <category android:name="android.intent.category.launcher" />             </intent-filter>         </activity>         <activity android:name="com.google.android.gms.ads.adactivity"           android:configchanges="keyboard|keyboardhidden|orientation|screenlayout|uimode|screensize|smallestscreensize"/>     </application>  </manifest> 

this java file

package com.example.interadd; import com.google.android.gms.ads.*; import android.support.v7.app.actionbaractivity; import android.os.bundle; import android.view.menu; import android.view.menuitem;  public class mainactivity extends actionbaractivity {      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);         // adview resource , load request.         adview adview = (adview)this.findviewbyid(r.id.adview);         adrequest adrequest = new adrequest.builder().build();         adview.loadad(adrequest);     }      @override     public boolean oncreateoptionsmenu(menu menu) {         // inflate menu; adds items action bar if present.         getmenuinflater().inflate(r.menu.main, menu);         return true;     }      @override     public boolean onoptionsitemselected(menuitem item) {         // handle action bar item clicks here. action bar         // automatically handle clicks on home/up button, long         // specify parent activity in androidmanifest.xml.         int id = item.getitemid();         if (id == r.id.action_settings) {             return true;         }         return super.onoptionsitemselected(item);     } } 

i fed have tried add ads in app failed have given 100% don't completed project have added google services app give error message following classes not instantiated: - com.google.android.gms.ads.adview (open class, show error log) see error log (window > show view) more details. tried download new eclipse found same error here hope getting project done here thank you