about FATAL EXCEPTION in Android

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hi sir
I am new on Android and I am now being face a problem in sms sending and receiving Actually I have 5 Activity class in project name ZigbeeActivity,SettingActivity,OnOffActivity etc each and a seprate class SendSMS and SMSReceiver Class now I wish to send a sms which compose from SettingActivit and call a function to SMSsend of SendSMSclass but when sending the Fatal Exception is shown on Settingctiviy screen.I have tied the source code of SendSMS class below pl. help me.

package com.sms;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;

import android.app.PendingIntent;
import android.telephony.SmsManager;
import android.widget.Toast;
import android.app.Activity;
public class SendSMS extends Activity{
	private Object obj;
	public SendSMS(Object object){
		this.obj = object;
		}
	  //---sends an SMS message to another device---
	@SuppressWarnings("unused")
	public void sendSMS(String phoneNumber, String message)
    { 
		try{
        String SENT = "SMS_SENT";
        String DELIVERED = "SMS_DELIVERED";
 
        PendingIntent sentPI = PendingIntent.getActivity(this, 0, new Intent(this,obj.getClass()), 0);
 
        PendingIntent deliveredPI = PendingIntent.getActivity(this, 0, new Intent(this,obj.getClass()), 0);
 
        //---when the SMS has been sent---
        registerReceiver(new BroadcastReceiver(){
            @Override
            public void onReceive(Context arg0, Intent arg1) {
                switch (getResultCode())
                {
                    case Activity.RESULT_OK:
                        Toast.makeText(getBaseContext(), "SMS sent", 
                                Toast.LENGTH_SHORT).show();
                        break;
                    case SmsManager.RESULT_ERROR_GENERIC_FAILURE:
                        Toast.makeText(getBaseContext(), "Generic failure", 
                                Toast.LENGTH_SHORT).show();
                        break;
                    case SmsManager.RESULT_ERROR_NO_SERVICE:
                        Toast.makeText(getBaseContext(), "No service", 
                                Toast.LENGTH_SHORT).show();
                        break;
                    case SmsManager.RESULT_ERROR_NULL_PDU:
                        Toast.makeText(getBaseContext(), "Null PDU", 
                                Toast.LENGTH_SHORT).show();
                        break;
                    case SmsManager.RESULT_ERROR_RADIO_OFF:
                        Toast.makeText(getBaseContext(), "Radio off", 
                                Toast.LENGTH_SHORT).show();
                        break;
                }
            }
        }, new IntentFilter(SENT));
 
        //---when the SMS has been delivered---
        registerReceiver(new BroadcastReceiver(){
            @Override
            public void onReceive(Context arg0, Intent arg1) {
                switch (getResultCode())
                {
                    case Activity.RESULT_OK:
                        Toast.makeText(getBaseContext(), "SMS delivered", 
                                Toast.LENGTH_SHORT).show();
                        break;
                    case Activity.RESULT_CANCELED:
                        Toast.makeText(getBaseContext(), "SMS not delivered", 
                                Toast.LENGTH_SHORT).show();
                        break;                        
                }
            }
        }, new IntentFilter(DELIVERED));        
 
        SmsManager sms = SmsManager.getDefault();
        sms.sendTextMessage(phoneNumber, null, message, sentPI, deliveredPI);        
  
    }catch(Exception e){
    	Toast.makeText(getBaseContext(), e.getMessage(), Toast.LENGTH_LONG).show();
    }
    }

}

thanks n regards
Om Parkash