Android : App force closes during displaying custom time picker

I am using this library to use custom time picker in my app. The relevant code from the TimePickerDialog class is as follows:

public static TimePickerDialog newInstance(OnTimeSetListener callback,
    int hourOfDay, int minute, boolean is24HourMode) {
TimePickerDialog ret = new TimePickerDialog();
ret.initialize(callback, hourOfDay, minute, is24HourMode);
return ret;
}

In my activity I have used this code to implement that:

com.android.datetimepicker.time.TimePickerDialog dialog = new        com.android.datetimepicker.time.TimePickerDialog();
dialog.newInstance((OnTimeSetListener) mTimeSetListener, getHour, getMinute, true);
FragmentManager fragmentManager;
fragmentManager = getSupportFragmentManager();
dialog.show(fragmentManager, "timepicker");

But when I launch the app, I get a force close with following error:

01-10 11:08:29.781 8727-8727/com.example.unplugged E/AndroidRuntime﹕ FATAL EXCEPTION: main java.lang.ClassCastException: com.example.unplugged.MainActivity$1 cannot be cast to com.android.datetimepicker.time.TimePickerDialog$OnTimeSetListener at com.example.unplugged.MainActivity.onClick(MainActivity.java:48) at android.view.View.performClick(View.java:4249) at android.view.View$PerformClick.run(View.java:17764) at android.os.Handler.handleCallback(Handler.java:730) at android.os.Handler.dispatchMessage(Handler.java:92) at android.os.Looper.loop(Looper.java:137) at android.app.ActivityThread.main(ActivityThread.java:5162) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:525) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:756) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:572) at de.robv.android.xposed.XposedBridge.main(XposedBridge.java:132) at dalvik.system.NativeStart.main(Native Method)

Any suggestions?

Edit: The call back method:

private TimePickerDialog.OnTimeSetListener mTimeSetListener = new TimePickerDialog.OnTimeSetListener()
{

    @Override
    public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
        setHour = hourOfDay;
        setMinute = minute;
    }
};