[Plugin: Smart Link – Shorten Your URL's] does not activate correctly

Warning: require_once(/var/www/vhosts/domain-url/httpdocs/wp-content/plugins/Smart-link-final/classes/models/PrliOptions.php) [function.require-once]: failed to open stream: No such file or directory in /var/www/vhosts/domain-url/httpdocs/wp-content/plugins/smart-link-final/prli-config.php on line 9

Fatal error: require_once() [function.require]: Failed opening required ‘/var/www/vhosts/domain-url/httpdocs/wp-content/plugins/Smart-link-final/classes/models/PrliOptions.php’ (include_path=’.:’) in /var/www/vhosts/domain-url/httpdocs/wp-content/plugins/smart-link-final/prli-config.php on line 9