懇請幫忙  出現錯誤!!    感謝

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package com.example.user.myapplication;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;

public class MainActivity extends AppCompatActivity {
private AutoCompleteTextView acTextView ;
   private  String[] res = {"02554","44544","12255","125555"}
   @Override
   protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_main);

       acTextView = (AutoCompleteTextView) findViewById(R.id.autoCompleteTextView1);
       ArrayAdapter<String> adapter = new ArrayAdapter<String>
               (this,android.R.layout.simple_expandable_list_item_1, res);
   }
}