Android crash when app is high score menu opened

I am new to android programming. I tried to execute a app from one of the tutorials and it is showing runtime error. If it runs highscores menu. Application closed. Below are the error messages from logcat and the activity file. Appreciate your help. Thanks in advance.
<div>

12-15 03:49:51.124: I/HighScores(1115): getScores() called12-15 03:49:51.154: I/HighScores(1115): getScores() no scores found12-15 03:49:51.354: I/Reversi, RevHSCustAd getView called(1115): position = 012-15 03:49:51.444: I/Reversi, RevHSCustAd getView called(1115): position = 012-15 03:49:51.454: D/AndroidRuntime(1115): Shutting down VM12-15 03:49:51.454: W/dalvikvm(1115): threadid=1: thread exiting with uncaught exception (group=0xb2a40ba8)12-15 03:49:51.594: D/dalvikvm(1115): GC_FOR_ALLOC freed 447K, 11% free 4353K/4880K, paused 89ms, total 100ms12-15 03:49:51.714: E/AndroidRuntime(1115): FATAL EXCEPTION: main12-15 03:49:51.714: E/AndroidRuntime(1115): Process: uk.co.flumeland.reversi, PID: 111512-15 03:49:51.714: E/AndroidRuntime(1115): java.lang.NullPointerException12-15 03:49:51.714: E/AndroidRuntime(1115): at uk.co.flumeland.reversi.RevHighScoreAdapter.getView(RevHighScoreAdapter.java:68)12-15 03:49:51.714: E/AndroidRuntime(1115): at android.widget.AbsListView.obtainView(AbsListView.java:2263)12-15 03:49:51.714: E/AndroidRuntime(1115): at android.widget.ListView.measureHeightOfChildren(ListView.java:1263)12-15 03:49:51.714: E/AndroidRuntime(1115): at android.widget.ListView.onMeasure(ListView.java:1175)12-15 03:49:51.714: E/AndroidRuntime(1115): at android.view.View.measure(View.java:16497)12-15 03:49:51.714: E/AndroidRuntime(1115): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)12-15 03:49:51.714: E/AndroidRuntime(1115): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404)12-15 03:49:51.714: E/AndroidRuntime(1115): at android.widget.LinearLayout.measureVertical(LinearLayout.java:695)12-15 03:49:51.714: E/AndroidRuntime(1115): at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)12-15 03:49:51.714: E/AndroidRuntime(1115): at android.view.View.measure(View.java:16497)12-15 03:49:51.714: E/AndroidRuntime(1115): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)12-15 03:49:51.714: E/AndroidRuntime(1115): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)12-15 03:49:51.714: E/AndroidRuntime(1115): at android.view.View.measure(View.java:16497)12-15 03:49:51.714: E/AndroidRuntime(1115): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)12-15 03:49:51.714: E/AndroidRuntime(1115): at com.android.internal.widget.ActionBarOverlayLayout.onMeasure(ActionBarOverlayLayout.java:327)12-15 03:49:51.714: E/AndroidRuntime(1115): at android.view.View.measure(View.java:16497)12-15 03:49:51.714: E/AndroidRuntime(1115): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)12-15 03:49:51.714: E/AndroidRuntime(1115): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)12-15 03:49:51.714: E/AndroidRuntime(1115): at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2291)12-15 03:49:51.714: E/AndroidRuntime(1115): at android.view.View.measure(View.java:16497)12-15 03:49:51.714: E/AndroidRuntime(1115): at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1916)12-15 03:49:51.714: E/AndroidRuntime(1115): at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1113)12-15 03:49:51.714: E/AndroidRuntime(1115): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1295)12-15 03:49:51.714: E/AndroidRuntime(1115): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1000)12-15 03:49:51.714: E/AndroidRuntime(1115): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5670)12-15 03:49:51.714: E/AndroidRuntime(1115): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:761)12-15 03:49:51.714: E/AndroidRuntime(1115): at android.view.Choreographer.doCallbacks(Choreographer.java:574)12-15 03:49:51.714: E/AndroidRuntime(1115): at android.view.Choreographer.doFrame(Choreographer.java:544)12-15 03:49:51.714: E/AndroidRuntime(1115): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:747)12-15 03:49:51.714: E/AndroidRuntime(1115): at android.os.Handler.handleCallback(Handler.java:733)12-15 03:49:51.714: E/AndroidRuntime(1115): at android.os.Handler.dispatchMessage(Handler.java:95)12-15 03:49:51.714: E/AndroidRuntime(1115): at android.os.Looper.loop(Looper.java:136)12-15 03:49:51.714: E/AndroidRuntime(1115): at android.app.ActivityThread.main(ActivityThread.java:5017)12-15 03:49:51.714: E/AndroidRuntime(1115): at java.lang.reflect.Method.invokeNative(Native Method)12-15 03:49:51.714: E/AndroidRuntime(1115): at java.lang.reflect.Method.invoke(Method.java:515)12-15 03:49:51.714: E/AndroidRuntime(1115): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)12-15 03:49:51.714: E/AndroidRuntime(1115): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)12-15 03:49:51.714: E/AndroidRuntime(1115): at dalvik.system.NativeStart.main(Native Method)12-15 03:49:51.864: W/CursorWrapperInner(1115): Cursor finalized without prior close()12-15 03:49:54.184: I/Process(1115): Sending signal. PID: 1115 SIG: 9
</div>
RevHighScoreAdapter.java

<div>

package uk.co.flumeland.reversi;

import java.util.ArrayList;
import java.lang.String;

import android.app.Activity;
import android.content.Context;
import android.net.Uri;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;

public class RevHighScoreAdapter extends ArrayAdapter {

private Score[] scores;
private Context context;

// Constructor
public RevHighScoreAdapter(Context context, Score[] score){
super(context, 0);
scores = score;
this.context = context;
}


@Override
public int getCount() {
// length of list
return scores.length;
}

@Override
public Object getItem(int position) {
// length of list
return position;
}

@Override
public long getItemId(int position) {
return position;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
View row = convertView;
Log.i("Reversi, RevHSCustAd getView called", "position = " + position );

if (row == null) {
LayoutInflater inflater = ((Activity) context).getLayoutInflater();
row = inflater.inflate(R.layout.high_scores_listview_row, parent, false);
}
TextView nameTV = (TextView) row.findViewById(R.id.hs_player_name_lv);
ImageView photoIV = (ImageView) row.findViewById(R.id.hs_player_image_lv);
TextView scoreTV = (TextView) row.findViewById(R.id.hs_score_lv);
Log.i("Reversi, RevHSCustAd getView called", "position = " + position );

//if (scores[position].getPhotolink() != null) {
//photoIV.setImageURI(Uri.parse(scores[position].getPhotolink()));
//} else {
//photoIV.setImageResource(R.drawable.social_add_person);
//}
nameTV.setText(scores[position].getName());
Log.i("Reversi, RevHSCustAd getView called", "position = " + position );
scoreTV.setText(String.valueOf(scores[position].getScore()));

return row;
}
}

</div>