오류 내용
java.lang.NullPointerException

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프로젝트 이름 :CardMatchGame
src - org.cardmatchgame
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☆cardGameView.jave

package org.cardmatchgame;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.view.View;

public class CardGameView extends View{
 Bitmap m_BackGroundImage;
 
 public CardGameView(Context context){
  super(context);
  m_BackGroundImage = BitmapFactory.decodeResource(getResources(),R.drawable.background,null);
  
    }
 @Override
  public void onDraw(Canvas canvas){
  canvas.drawBitmap(m_BackGroundImage,0,0,null);
 }
}
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CardGameActivity.java
package org.cardmatchgame;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;

public class CardGameActivity extends Activity {

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_card_game);
 }

 @Override
 public boolean onCreateOptionsMenu(Menu menu) {
  // Inflate the menu; this adds items to the action bar if it is present.
  getMenuInflater().inflate(R.menu.activity_card_game, menu);
  return true;
 }

}

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☆layout - activity_card_game.xmi

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".CardGameActivity" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:text="@string/hello_world" />

</RelativeLayout>

진짜...왜 계속 이런 오류가 나나요?

고쳐야하는부분 으로 가르쳐주세요 ㅜㅜ