Merge "Fix the comments of onError() callback"

        /**

         * Informs the user that there is some error about the scan.

         *

         * This callback will be called whenever there is any error about the scan, but the scan

         * won't stop unless the onComplete() callback is called.

         * This callback will be called whenever there is any error about the scan, and the scan

         * will be terminated. onComplete() will NOT be called.

         */

        public void onError(int error) {}

    }