Error saying that the imports for okHttp doesnt exist. What to do?

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import okhttp3.Call;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;

public class MovieActivity extends Activity {

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

        // Get some movie information!
        String apiUrl = "http://api.rottentomatoes.com/api/public/v1.0/movies.json?apikey=xyz&q=hobbit";

        OkHttpClient client = new OkHttpClient();


       /* try {
            Response response = call.execute();
            if (response.isSuccessful()) {

                Log.v(TAG, response.body().string());
            }

        } catch (IOException ioe) {
            Log.e(TAG, "Exception cought: ", e);
        }
      */
    }
}