I Get Fatal Exception: Main When I Start My App How To Fix?

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Java

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Android

hi dudes
i have this code in class file:

ublic class MainActivity extends ListActivity {

	 DBAdapter db;
	 List <Story> storyList;
	 ListView lvMain;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
    	Log.i("#%%%%%%%%%%%%%%%%%%%%%","1");
    	
        super.onCreate(savedInstanceState);
        Log.i("#%%%%%%%%%%%%%%%%%%%%%","1.5");
        setContentView(R.layout.activity_main2);
        Log.i("#%%%%%%%%%%%%%%%%%%%%%","2");
        db.open();
        storyList=db.GetAllItems();
        Log.i("#%%%%%%%%%%%%%%%%%%%%%","3");
        if (storyList.size()==0)//import database if local database is empty.
        {
        	Log.i("#%%%%%%%%%%%%%%%%%%%%%","4");
        	InputStream sourcePath;
        	OutputStream destPath;
			try {
				sourcePath = getBaseContext().getAssets().open("StoryDB");
			    destPath=new FileOutputStream( "/data/data/"+getPackageName()+"/databases/data");
			    Log.i("#%%%%%%%%%%%%%%%%%%%%%","5");
			    CopyDB(sourcePath,destPath);
			    Log.i("#%%%%%%%%%%%%%%%%%%%%%","5.5");
				
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
       			
        
        	Log.i(DBAdapter.TAG,"@@@DB copy finished.");
        	 
        	storyList=db.GetAllItems();
        	
        }
    }

and in xml file (activity_main) i have this:

<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"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBottom="@+id/button1"
        android:layout_toRightOf="@+id/button1"
        android:text="Button" />

    <EditText
        android:id="@+id/editText1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBottom="@+id/button2"
        android:layout_toRightOf="@+id/button2"
        android:ems="10" >

        <requestFocus />
    </EditText>

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginTop="25dp"
        android:text="Button" />

    <ListView
        android:id="@+id/lvMain"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/button1"
        android:layout_below="@+id/button1"
        android:layout_marginTop="14dp" >
    </ListView>

</RelativeLayout>

now i wanna start that i get this error:

02-14 21:06:57.715: W/ActivityThread(19498): Application behnam.mohammadi.book1 can be debugged on port 8100...
02-14 21:06:57.745: I/#%%%%%%%%%%%%%%%%%%%%%(19498): 1
02-14 21:06:57.745: I/#%%%%%%%%%%%%%%%%%%%%%(19498): 1.5
02-14 21:06:57.815: D/AndroidRuntime(19498): Shutting down VM
02-14 21:06:57.815: W/dalvikvm(19498): threadid=1: thread exiting with uncaught exception (group=0x40f922a0)
02-14 21:06:57.835: E/AndroidRuntime(19498): FATAL EXCEPTION: main
02-14 21:06:57.835: E/AndroidRuntime(19498): java.lang.RuntimeException: Unable to start activity ComponentInfo{behnam.mohammadi.book1/behnam.mohammadi.book1.MainActivity}: java.lang.RuntimeException: Your content must have a ListView whose id attribute is 'android.R.id.list'
02-14 21:06:57.835: E/AndroidRuntime(19498): 	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2100)
02-14 21:06:57.835: E/AndroidRuntime(19498): 	at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2125)
02-14 21:06:57.835: E/AndroidRuntime(19498): 	at android.app.ActivityThread.access$600(ActivityThread.java:140)
02-14 21:06:57.835: E/AndroidRuntime(19498): 	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1227)
02-14 21:06:57.835: E/AndroidRuntime(19498): 	at android.os.Handler.dispatchMessage(Handler.java:99)
02-14 21:06:57.835: E/AndroidRuntime(19498): 	at android.os.Looper.loop(Looper.java:137)
02-14 21:06:57.835: E/AndroidRuntime(19498): 	at android.app.ActivityThread.main(ActivityThread.java:4898)
02-14 21:06:57.835: E/AndroidRuntime(19498): 	at java.lang.reflect.Method.invokeNative(Native Method)
02-14 21:06:57.835: E/AndroidRuntime(19498): 	at java.lang.reflect.Method.invoke(Method.java:511)
02-14 21:06:57.835: E/AndroidRuntime(19498): 	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1006)
02-14 21:06:57.835: E/AndroidRuntime(19498): 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:773)
02-14 21:06:57.835: E/AndroidRuntime(19498): 	at dalvik.system.NativeStart.main(Native Method)
02-14 21:06:57.835: E/AndroidRuntime(19498): Caused by: java.lang.RuntimeException: Your content must have a ListView whose id attribute is 'android.R.id.list'
02-14 21:06:57.835: E/AndroidRuntime(19498): 	at android.app.ListActivity.onContentChanged(ListActivity.java:243)
02-14 21:06:57.835: E/AndroidRuntime(19498): 	at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:311)
02-14 21:06:57.835: E/AndroidRuntime(19498): 	at android.app.Activity.setContentView(Activity.java:1924)
02-14 21:06:57.835: E/AndroidRuntime(19498): 	at behnam.mohammadi.book1.MainActivity.onCreate(MainActivity.java:30)
02-14 21:06:57.835: E/AndroidRuntime(19498): 	at android.app.Activity.performCreate(Activity.java:5206)
02-14 21:06:57.835: E/AndroidRuntime(19498): 	at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1083)
02-14 21:06:57.835: E/AndroidRuntime(19498): 	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2064)
02-14 21:06:57.835: E/AndroidRuntime(19498): 	... 11 more