Your content must have a ListView whose id attribute is 'android.R.id.list'

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Hi, when I go to activity say unfortantly.... and close program
in my erro list say : Your content must have a ListView whose id attribute is 'android.R.id.list'
its my xml of activity :

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <ListView
        android:id="@+id/list"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >
    </ListView>

</LinearLayout>

and its my list_item activity :

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >
        
       
        
        <ImageView
            android:id="@+id/img1"
            android:layout_width="60dp"
            android:layout_height="60dp"
            android:padding="5dp"
            android:layout_gravity="left" />
        
         <TextView
            android:id="@+id/txt1"
            android:layout_width="80dp"
            android:layout_height="wrap_content"
            android:padding="5dp"
            android:textSize="15sp"
            android:text="Text_1" />
    </LinearLayout>

</LinearLayout>

and its my java cod :

package com.momeni.shams;

import android.app.ListActivity;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.ListView;

public class Showperson extends ListActivity {

    public ListView list1;
    public String   number_of_keys;



    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_showperson);
        Bundle bundle = getIntent().getExtras();
        String catid = bundle.getString("catid");

        Dal db = new Dal(this);
        db.database();
        db.open();
        int count = db.count(catid);
        String[] name = new String[count];

        for (int i = 0; i < count; i++)
        {
            name[i] = db.Display(i, 3, catid);
        }
        setListAdapter(new MyAdapter(this, android.R.layout.simple_list_item_1, R.id.txt1, name));
        list1 = (ListView) findViewById(R.id.list);
        list1.setOnItemClickListener(new AdapterView.OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> parent, final View view,
                                    int position, long id) {
                Intent i = new Intent(getApplicationContext(), Showdetale.class);
                number_of_keys = String.valueOf(position + 1);
                i.putExtra("key_number", number_of_keys);
                startActivity(i);
            }

        });
        //
        //        list1.setAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, name));

    }

    private class MyAdapter extends ArrayAdapter<String> {

        public MyAdapter(Context context, int resource, int textViewResurceid, String[] strings) {
            super(context, resource, textViewResurceid, strings);

        }



        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            LayoutInflater intflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            View row = intflater.inflate(R.layout.list_item, parent, false);

            //            String stringName = String.valueOf(position + 1);
            //            int string_res_ID = getResources().getIdentifier(stringName, "string", getPackageName());
            //            String my_string = getResources().getString(string_res_ID);
            //            TextView tv = (TextView) row.findViewById(R.id.txt1);
            //            tv.setText(my_string);

            String imageName = "a" + String.valueOf(position + 1);
            int image_res_ID = getResources().getIdentifier(imageName, "drawable", getPackageName());
            ImageView iv = (ImageView) row.findViewById(R.id.img1);
            iv.setImageResource(image_res_ID);
            return row;

        }
    }

}

Pleazzzzz HELPPPP MEEEEEE :(
I search evry site but i cant solve this