Error in the fragment

I'm trying to make a calendar for birthdays, but in fragment where I put the calendar is giving an error that I do not know how to fix.

Error

06-02 01:17:33.346 15106-15106/com.example.educador.myapplication E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.educador.myapplication, PID: 15106
java.lang.NullPointerException: Attempt to invoke virtual method 'void com.github.sundeepk.compactcalendarview.CompactCalendarView.setUseThreeLetterAbbreviation(boolean)' on a null object reference
    at com.example.educador.myapplication.Aniversarios.onCreateView(Aniversarios.java:49)
    at android.support.v4.app.Fragment.performCreateView(Fragment.java:2354)
    at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1419)
    at android.support.v4.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManager.java:1740)
    at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1809)
    at android.support.v4.app.BackStackRecord.executeOps(BackStackRecord.java:799)
    at android.support.v4.app.FragmentManagerImpl.executeOps(FragmentManager.java:2580)
    at android.support.v4.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2367)
    at android.support.v4.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManager.java:2322)
    at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:2229)
    at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:700)
    at android.os.Handler.handleCallback(Handler.java:790)
    at android.os.Handler.dispatchMessage(Handler.java:99)
    at android.os.Looper.loop(Looper.java:164)
    at android.app.ActivityThread.main(ActivityThread.java:6494)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)

Fragment code:

public class Aniversarios extends Fragment {

    CompactCalendarView compactCalendar;
    private SimpleDateFormat dateFormatMonth = new SimpleDateFormat("MMMM- yyyy", Locale.getDefault());


    public Aniversarios() {
        // Required empty public constructor
    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {

        //getActivity().setContentView(R.layout.fragment_aniversarios);
        // Inflate the layout for this fragment

        final ActionBar actionBar = ((AppCompatActivity)getActivity()).getSupportActionBar();
        actionBar.setDisplayHomeAsUpEnabled(false);
        actionBar.setTitle(null);

        compactCalendar = getActivity().findViewById(R.id.compactcalendar_view);
        compactCalendar.setUseThreeLetterAbbreviation(true);

        //Set an event for Teachers' Professional Day 2016 which is 21st of October

        Event ev1 = new Event(Color.RED, 1477040400000L, "Teachers' Professional Day");
        compactCalendar.addEvent(ev1);

        compactCalendar.setListener(new CompactCalendarView.CompactCalendarViewListener() {
            @Override
            public void onDayClick(Date dateClicked) {
                Context context = getActivity().getApplicationContext();

                if (dateClicked.toString().compareTo("Fri Oct 21 00:00:00 AST 2016") == 0) {
                    Toast.makeText(context, "Teachers' Professional Day", Toast.LENGTH_SHORT).show();
                }else {
                    Toast.makeText(context, "No Events Planned for that day", Toast.LENGTH_SHORT).show();
                }


            }

            @Override
            public void onMonthScroll(Date firstDayOfNewMonth) {
                actionBar.setTitle(dateFormatMonth.format(firstDayOfNewMonth));
            }

        });



        return inflater.inflate(R.layout.fragment_aniversarios, container, false);
    }

}