achartengine in android not working

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http://stackoverflow.com – I am using achartengine. My code has no error but when it starts it getting me error dialog and stops the program. Here is my code.. BuyersActivity.java activity class public class BuyersActivity extends Activity { private static final String DEFAULT = "N/A"; public String user_data=""; public static DefaultHttpClient client; String[] info=new String[5]; String performance_graph=""; public final static String EXTRA_MESSAGE = "com.mobile.bidnemo.MESSAGE"; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState (HowTos)