When I call mWifiManager.isWifiEnabled() , program is crash.

my Code is:
---------------------------------------------
import android.app.Activity;
import android.net.wifi.ScanResult;
import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.util.Log;

public class HelloWIFI extends Activity {
        /** Called when the activity is first created. */

        private WifiManager mWifiManager;

        @Override
        public void onCreate(Bundle savedInstanceState) {
                super.onCreate(savedInstanceState);
                setContentView(R.layout.main);

                mWifiManager =
(WifiManager)this.getSystemService(this.WIFI_SERVICE);
                Log.i("INFO", "WifiState = " + mWifiManager.getWifiState());
                if (mWifiManager.isWifiEnabled())
                {
                        Log.i("INFO", "WIFI is enable");
                }
                else
                {
                        Log.w("Warning", "WIFI is NOT enable");
                }

                mWifiManager.setWifiEnabled(true);
                mWifiManager.startScan();

                for (ScanResult result:mWifiManager.getScanResults())
                {
                        Log.i("INFO", "ScanResult:" + result.toString());
                }
        }
}

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