title: Cannot instantiate class on supportInvalidateOptionsMenu();
body: <p>Im using ActionBarSherlock and I want a rebuild of the ActionBar everytime a item is clicked. For that im using</p>
  
  <pre><code>supportInvalidateOptionsMenu();
  </code></pre>
  
  <p>Everytime it is called i got a Warning (tagged with MenuInflater)</p>
  
  <pre><code>Cannot instantiate class: @16974108
  java.lang.ClassNotFoundException: @16974108 in loader dalvik.system.PathClassLoader[/data/app/de.abc.android.reader-1.apk]
      at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:251)
      at java.lang.ClassLoader.loadClass(ClassLoader.java:540)
      at java.lang.ClassLoader.loadClass(ClassLoader.java:500)
      at com.actionbarsherlock.view.MenuInflater$MenuState.newInstance(MenuInflater.java:463)
      at com.actionbarsherlock.view.MenuInflater$MenuState.readItem(MenuInflater.java:366)
      at com.actionbarsherlock.view.MenuInflater.parseMenu(MenuInflater.java:147)
      at com.actionbarsherlock.view.MenuInflater.inflate(MenuInflater.java:97)
      at de.abc.android.reader.ui.PaperPlayer.onCreateOptionsMenu(PaperPlayer.java:102)
      at com.actionbarsherlock.app.SherlockFragmentActivity.onCreatePanelMenu(SherlockFragmentActivity.java:231)
      at com.actionbarsherlock.ActionBarSherlock.callbackCreateOptionsMenu(ActionBarSherlock.java:543)
      at com.actionbarsherlock.internal.ActionBarSherlockCompat.preparePanel(ActionBarSherlockCompat.java:463)
      at com.actionbarsherlock.internal.ActionBarSherlockCompat.dispatchInvalidateOptionsMenu(ActionBarSherlockCompat.java:269)
      at com.actionbarsherlock.app.SherlockFragmentActivity.invalidateOptionsMenu(SherlockFragmentActivity.java:138)
      at com.actionbarsherlock.app.SherlockFragmentActivity.supportInvalidateOptionsMenu(SherlockFragmentActivity.java:144)
      at de.abc.android.reader.ui.PaperPlayer.setFontSizeUp(PaperPlayer.java:251)
      at de.abc.android.reader.ui.PaperPlayer.onOptionsItemSelected(PaperPlayer.java:118)
      at com.actionbarsherlock.app.SherlockFragmentActivity.onMenuItemSelected(SherlockFragmentActivity.java:279)
      at com.actionbarsherlock.ActionBarSherlock.callbackOptionsItemSelected(ActionBarSherlock.java:587)
      at com.actionbarsherlock.internal.ActionBarSherlockCompat.onMenuItemSelected(ActionBarSherlockCompat.java:513)
      at com.actionbarsherlock.internal.view.menu.MenuBuilder.dispatchMenuItemSelected(MenuBuilder.java:738)
      at com.actionbarsherlock.internal.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:148)
      at com.actionbarsherlock.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:879)
      at com.actionbarsherlock.internal.view.menu.ActionMenuView.invokeItem(ActionMenuView.java:510)
      at com.actionbarsherlock.internal.view.menu.ActionMenuItemView.onClick(ActionMenuItemView.java:145)
      at android.view.View.performClick(View.java:3110)
      at android.view.View$PerformClick.run(View.java:11934)
      at android.os.Handler.handleCallback(Handler.java:587)
      at android.os.Handler.dispatchMessage(Handler.java:92)
      at android.os.Looper.loop(Looper.java:132)
      at android.app.ActivityThread.main(ActivityThread.java:4135)
      at java.lang.reflect.Method.invokeNative(Native Method)
      at java.lang.reflect.Method.invoke(Method.java:491)
      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841)
      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599)
      at dalvik.system.NativeStart.main(Native Method)
  </code></pre>
  
  <p>Here the methods for Building the ActionBar:</p>
  
  <pre><code>@Override
  public boolean onCreateOptionsMenu(Menu menu) {
      MenuInflater inflater = getSupportMenuInflater();
      inflater.inflate(R.menu.paperplayer, menu);
      if (isBiggestFontsize(getCurrentFontsize())) menu.findItem(R.id.ic_action_textup).setEnabled(false);
      if (isSmallestFontsize(getCurrentFontsize())) menu.findItem(R.id.ic_action_textdown).setEnabled(false);     
      return true;
  }
  
  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
      switch (item.getItemId()) {
      case android.R.id.home:
          // app icon in action bar clicked; go home
          Intent intent = new Intent(this, Library.class);
          intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
          startActivity(intent);
          return true;
      case R.id.ic_action_textup:
          setFontSizeUp();
          return true;
      case R.id.ic_action_textdown:
          setFontSizeDown();
          return true;
      default:
          return super.onOptionsItemSelected(item);
      }
  }
  </code></pre>
  
  <p>Its working well, but I always get this warning which makes me thinking ...</p>
  
  <p>Thanks for help!</p>