[android-developers] NullPointerException

I have an xml file in asset folder, i am trying to parse this file by using sax parser ,but an exception found...(NullPointerException,  / or could not read the file)

AssetManager manager = getAssets();
InputStream is = manager.open("City.xml");
                   
 // xmlR.parse(new InputSource(getAssets().open("City.xml")));
 //  xmlR.parse(new InputSource(getAssets().open("City.xml")));

                xmlR.parse(new InputSource(is));


could you help me please .. thanks in advance

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