java.lang.NullPointerException in phonegap android

Its your code :-

public class MainActivity extends DroidGap {

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);


appView.addJavascriptInterface(this, "MainActivity");
super.loadUrl(Config.getStartUrl());
}


}
Change the code :-
public class MainActivity extends DroidGap {

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
super.init();

appView.addJavascriptInterface(this, "MainActivity");
super.loadUrl(Config.getStartUrl());
}


}