MainActivity Not receiving callbacks of Items Tapped

[bxute]

Although event Listeners are subscribed , no callbacks are received

Listeners are as declared

private void subscribeToTaskAddListener(){
        SearchResultListAdapter.getInstance(this).setOnTaskAddListener(new TaskAddListener() {
            @Override
            public void onTaskTapped() {
                log("callback: task tapped");
                progressDialog = new ProgressDialog(MainActivity.this);
                progressDialog.setMessage("Requesting Your Stuff..");
                progressDialog.setCancelable(false);
                progressDialog.show();
            }

            @Override
            public void onTaskAddedToQueue(String task_info) {
                log("callback: task added to download queue");
                progressDialog.dismiss();
                makeToast(task_info + " Added To Download");
                //TODO: navigate to DownloadsActivity
            }
        });
    }

and set as

..
..
          setSearchView();
                pinFAB();
                subscribeToTaskAddListener();
        }
..

in

onCreate();

[bxute]

On force-call to call
we get

08-14 13:22:11.532  11102-11102/musicgenie.com.musicgenie E/AndroidRuntime﹕ FATAL EXCEPTION: main
    Process: musicgenie.com.musicgenie, PID: 11102
    java.lang.NullPointerException: Attempt to invoke interface method 'void musicgenie.com.musicgenie.interfaces.TaskAddListener.onTaskTapped()' on a null object reference
            at musicgenie.com.musicgenie.adapters.SearchResultListAdapter.addDownloadTask(SearchResultListAdapter.java:148)
            at musicgenie.com.musicgenie.adapters.SearchResultListAdapter.access$000(SearchResultListAdapter.java:42)
            at musicgenie.com.musicgenie.adapters.SearchResultListAdapter$1.onClick(SearchResultListAdapter.java:110)
            at android.view.View.performClick(View.java:4802)
            at android.view.View$PerformClick.run(View.java:20102)
            at android.os.Handler.handleCallback(Handler.java:810)
            at android.os.Handler.dispatchMessage(Handler.java:99)
            at android.os.Looper.loop(Looper.java:189)
            at android.app.ActivityThread.main(ActivityThread.java:5529)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)