NullPointerException while Loading and Displaying JSON content into a listview

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http://stackoverflow.com – I am attempting to load JSON content into a listview containing image and text but I'm getting a NullPointerException' in line 154 i.e lv1.setAdapter(efficienadapter); in Actualities.class . I don't know if its because the postlist is null or an error in my code. someone can help me please My Actualites class public class Actualites extends Activity { ListView lv1; ProgressDialog ShowProgress; private static String url = "url"; // JSON Node names private static final String TAG_ID = "id"; private static final String TAG_TITLE = "title"; private static fi (HowTos)