Android : Why does the LocationTracker app in Android 4 Application Development always stops?

This is the sample code for the AndroidManifest.xml of the app

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.locationtracker2"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="14" />

    <uses-permission android:name="android.permission.RECEIVE_SMS" />
    <uses-permission android:name="android.permission.SEND_SMS" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.locationtracker2.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <service android:name=".MyService" />
    <!-- This line will make the APP woken when there is an incoming SMS message -->
    <receiver android:name=".SMSReceiver">
        <intent-filter android:priority="100">
            <action
                android:name="android.provider.Telephony.SMS_RECEIVED" />
        </intent-filter>
    </receiver>

    </application>

</manifest>

And for the SMSReceiver.java class code is

package net.learn2develop.LocationTracker2;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.telephony.SmsManager;
import android.telephony.SmsMessage;

public class SMSReceiver extends BroadcastReceiver{
    LocationManager lm;
    LocationListener locationListener;
    String senderTel;


    public void onReceive(Context context, Intent intent){
        Bundle bundle = intent.getExtras();
        SmsMessage[] msgs = null;
        String str = "";
        if(bundle != null){
            senderTel = "";
            Object[] pdus = (Object[]) bundle.get("pdus");
            msgs = new SmsMessage[pdus.length];
            for(int i=0; i<msgs.length; i++){
                msgs[i] = SmsMessage.createFromPdu((byte[])pdus[i]);
                if(i==0){
                    senderTel = msgs[i].getOriginatingAddress();
                }
                str += msgs[i].getMessageBody().toString();
            }
            if(str.startsWith("Where are you?")){
                lm = (LocationManager)context.getSystemService(Context.LOCATION_SERVICE);
                locationListener = new MyLocationListener();
                lm.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 60000, 1000, locationListener);
                this.abortBroadcast();
            }
        }
    }

    private class MyLocationListener implements LocationListener{

        public void onLocationChanged(Location loc){
            if(loc != null){
                SmsManager sms = SmsManager.getDefault();
                sms.sendTextMessage(senderTel, null, "http://maps.google.com/maps?q=" + loc.getLatitude() + "," + loc.getLongitude(), null, null);
                lm.removeUpdates(locationListener);
            }
        }

        public void onProviderDisabled(String provider){
        }

        public void onProviderEnabled(String provider){
        }

        public void onStatusChanged(String provider, int status, Bundle extras){
        }
    }
}

When I try to run this application it always stops. How do I prevent this problem? I have been searching for solutions since forever. I just want to locate using SMS and the network provider. Can you guys suggest other or help me solve this problem. It would be much appreciated