ошибка loopj android-async-http

Я скачал файл android-async-http-1.4.8.jar и поместил его в папку app->libs. Затем добавьте следующий код в файл MainActivity.

    AsyncHttpClient client = new AsyncHttpClient();
    client.get("http://www.google.com", new AsyncHttpResponseHandler() {

        @Override
        public void onStart() {
            // called before request is started
        }

        @Override
        public void onSuccess(int statusCode, Header[] headers, byte[] response) {
            // called when response HTTP status is "200 OK"
            textViewDailyTip.setText(response.toString());
        }

        @Override
        public void onFailure(int statusCode, Header[] headers, byte[] errorResponse, Throwable e) {
            // called when response HTTP status is "4XX" (eg. 401, 403, 404)
        }

        @Override
        public void onRetry(int retryNo) {
            // called when request is retried
        }
    });

но я получил ошибку.

Error:(50, 9) error: cannot access AsyncHttpClient
bad class file: /Users/user/AndroidStudioProjects/yan.com/Yin/app/libs/android-async-http-1.4.8.jar(com/loopj/android/http/AsyncHttpClient.class)
unable to access file: null
Please remove or make sure it appears in the correct subdirectory of the classpath.