Thank you for your response Tara, I erased it just as you told me (the whole xcalendar folder from FTP) But I still see this error ??
Warning: require_once(/home/eariisco/public_html/blueboxmx.com/wp-content/plugins/xcalendar/xcalendar.php): failed to open stream: No such file or directory in /home/eariisco/public_html/blueboxmx.com/wp-config.php on line 92
Fatal error: require_once(): Failed opening required ‘/home/eariisco/public_html/blueboxmx.com/wp-content/plugins/xcalendar/xcalendar.php’ (include_path=’.:/usr/lib/php:/usr/local/lib/php’) in /home/eariisco/public_html/blueboxmx.com/wp-config.php on line 92