04-27 10:17:27.838: E/AndroidRuntime(3944): java.lang.RuntimeException: Unable to instantiate activity` `ComponentInfo{mobi.pdf417.demo/mobi.pdf417.demo.PromoCodeActivity}: java.lang.NullPointerException

Intent intent2 = new Intent(this, PromoCodeActivity2.class);
             //intent.putExtra(PromoCodeActivity.requestString, httpRequestString);
            //intent2.putExtra("requestString", httpRequestString);
             startActivity(intent2);
             finish();

Button scanBt=(Button) findViewById(R.id.btnScan);
    scanBt.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
        // TODO Auto-generated method stub


            btnScan_click(v);
            populateListViewFromDB();
        }
    });


    public void btnScan_click(View v) {
    Log.i(TAG, "scan will be performed");
    // Intent for ScanActivity
    Intent intent = new Intent(this, Pdf417ScanActivity.class);
    intent.putExtra(Pdf417ScanActivity.EXTRAS_LICENSE_KEY, "BTH7-L4JO-UI5T-JAFP-YSKX-BXZT-SDKE-LKIZ"); // demo license key for package mobi.pdf417.demo
    Pdf417MobiSettings sett = new Pdf417MobiSettings();
    // set this to true to enable PDF417 scanning
    sett.setPdf417Enabled(true);
    sett.setDecodeUSDriverLicenseData(true);
    sett.setDontShowDialog(true);
    sett.setRemoveOverlayEnabled(true);
    intent.putExtra(Pdf417ScanActivity.EXTRAS_SETTINGS, sett);

    // Start Activity
    startActivityForResult(intent, MY_REQUEST_CODE);
}

04-27 11:44:41.749: E/AndroidRuntime(22132): FATAL EXCEPTION: main
04-27 11:44:41.749: E/AndroidRuntime(22132): Process: mobi.pdf417.demo, PID: 22132
04-27 11:44:41.749: E/AndroidRuntime(22132): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{mobi.pdf417.demo/mobi.pdf417.demo.PromoCodeActivity}: java.lang.NullPointerException
04-27 11:44:41.749: E/AndroidRuntime(22132):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2163)
04-27 11:44:41.749: E/AndroidRuntime(22132):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2286)
04-27 11:44:41.749: E/AndroidRuntime(22132):    at android.app.ActivityThread.access$800(ActivityThread.java:144)
04-27 11:44:41.749: E/AndroidRuntime(22132):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1246)
04-27 11:44:41.749: E/AndroidRuntime(22132):    at android.os.Handler.dispatchMessage(Handler.java:102)
04-27 11:44:41.749: E/AndroidRuntime(22132):    at android.os.Looper.loop(Looper.java:212)
04-27 11:44:41.749: E/AndroidRuntime(22132):    at android.app.ActivityThread.main(ActivityThread.java:5135)
04-27 11:44:41.749: E/AndroidRuntime(22132):    at java.lang.reflect.Method.invokeNative(Native Method)
04-27 11:44:41.749: E/AndroidRuntime(22132):    at java.lang.reflect.Method.invoke(Method.java:515)
04-27 11:44:41.749: E/AndroidRuntime(22132):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:878)
04-27 11:44:41.749: E/AndroidRuntime(22132):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
04-27 11:44:41.749: E/AndroidRuntime(22132):    at dalvik.system.NativeStart.main(Native Method)
04-27 11:44:41.749: E/AndroidRuntime(22132): Caused by: java.lang.NullPointerException
04-27 11:44:41.749: E/AndroidRuntime(22132):    at android.content.ContextWrapper.getPackageName(ContextWrapper.java:135)
04-27 11:44:41.749: E/AndroidRuntime(22132):    at android.content.ComponentName.<init>(ComponentName.java:77)
04-27 11:44:41.749: E/AndroidRuntime(22132):    at android.content.Intent.<init>(Intent.java:3826)
04-27 11:44:41.749: E/AndroidRuntime(22132):    at mobi.pdf417.demo.PromoCodeActivity.<init>(PromoCodeActivity.java:79)
04-27 11:44:41.749: E/AndroidRuntime(22132):    at java.lang.Class.newInstanceImpl(Native Method)
04-27 11:44:41.749: E/AndroidRuntime(22132):    at java.lang.Class.newInstance(Class.java:1208)
04-27 11:44:41.749: E/AndroidRuntime(22132):    at android.app.Instrumentation.newActivity(Instrumentation.java:1061)
04-27 11:44:41.749: E/AndroidRuntime(22132):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2154)
04-27 11:44:41.749: E/AndroidRuntime(22132):    ... 11 more