title: NoClassDefFoundError exception is throwing
body: <p>hi dears I am getting an error in logcat which is totally unknown to me please help me out for this</p>
  
  <pre><code>java.lang.NoClassDefFoundError: android.support.v7.internal.view.menu.MenuBuilder
              at android.support.v7.app.AppCompatDelegateImplV7.initializePanelMenu(AppCompatDelegateImplV7.java:1012)
              at android.support.v7.app.AppCompatDelegateImplV7.preparePanel(AppCompatDelegateImplV7.java:1074)
              at android.support.v7.app.AppCompatDelegateImplV7.doInvalidatePanelMenu(AppCompatDelegateImplV7.java:1374)
              at android.support.v7.app.AppCompatDelegateImplV7.access$100(AppCompatDelegateImplV7.java:89)
              at android.support.v7.app.AppCompatDelegateImplV7$1.run(AppCompatDelegateImplV7.java:126)
              at android.os.Handler.handleCallback(Handler.java:800)
              at android.os.Handler.dispatchMessage(Handler.java:100)
              at android.os.Looper.loop(Looper.java:194)
              at android.app.ActivityThread.main(ActivityThread.java:5391)
              at java.lang.reflect.Method.invokeNative(Native Method)
              at java.lang.reflect.Method.invoke(Method.java:525)
              at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:833)
              at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
              at dalvik.system.NativeStart.main(Native Method)
  </code></pre>