android sms manager using fragments on onCreateView, onClick not working

I have a code on android that using fragments but when I add an onclick on the code which the sendSMS function will be called an error occured on executing it on a dual sim phone saying "Unfortunately, has stopped" when I click the button btnSendSMS . No error found on LogCat.

Here is my code on the sendSms:

private void sendSMS(String phoneNumber, String message)
    {        
        SmsManager sms = SmsManager.getDefault();

        String SENT = "SMS_SENT";

        PendingIntent sentPI = PendingIntent.getBroadcast(getActivity(), 0, new Intent(
                SENT), 0);

        getActivity().registerReceiver(new BroadcastReceiver() {
            public void onReceive(Context arg0, Intent arg1) {
                switch (getResultCode()) {
                case Activity.RESULT_OK:
                    Toast.makeText(getActivity(), "Message Sent",
                            Toast.LENGTH_SHORT).show();
                    break;

                case SmsManager.RESULT_ERROR_GENERIC_FAILURE:
                    Toast.makeText(getActivity(), "Generic failure",
                            Toast.LENGTH_SHORT).show();
                    break;

                case SmsManager.RESULT_ERROR_NO_SERVICE:
                    Toast.makeText(getActivity(), "No service",
                            Toast.LENGTH_SHORT).show();
                    break;

                case SmsManager.RESULT_ERROR_NULL_PDU:
                    Toast.makeText(getActivity(), "Null PDU",
                            Toast.LENGTH_SHORT).show();
                    break;

                case SmsManager.RESULT_ERROR_RADIO_OFF:
                    Toast.makeText(getActivity(), "Radio off",
                            Toast.LENGTH_SHORT).show();
                    break;
                }
            }
        }, new IntentFilter(SENT));


        sms.sendTextMessage(phoneNumber, null, message, sentPI, null);
    }

Code on the button:

btnSendSMS = (Button) myFragmentView.findViewById(R.id.button2);

btnSendSMS.setOnClickListener(new View.OnClickListener() 
        {
            public void onClick(View v) 
            { 
                String phoneNo =  txtPhoneNo.getText().toString();
                String message =  txtMessage.getText().toString();
                smsGateway     =  "<my number>";

                 if(phoneNo.length() == 0) {
                    Toast.makeText(getActivity(), "Please enter a number!", Toast.LENGTH_LONG).show();           
                } else if(message.length() == 0) {
                    Toast.makeText(getActivity(), "Please enter a message!", Toast.LENGTH_LONG).show();
                } else {
                    Toast.makeText(getActivity(), "Message has been sent", Toast.LENGTH_LONG).show();      
                    sendSMS(smsGateway,message);
                }
            }
        });

Please help dont know where is my error. This code works when I extends Activity instead of Fragments and changing getActivity() to getBaseContext().

Thank you!