Fatal error message with slide in plugin

Hello,

I'm seeing the following fatal error message when activating the slide in plugin:

Warning: require_once(/var/www/vhosts/moneyweekdev.com/releases/20131001205139/wp-content/mu-plugins/lib/class_wdsi_mailchimp.php): failed to open stream: No such file or directory in /var/www/vhosts/moneyweekdev.com/releases/20131001205139/wp-content/plugins/slide-in/loader.php on line 56 Fatal error: require_once(): Failed opening required '/var/www/vhosts/moneyweekdev.com/releases/20131001205139/wp-content/mu-plugins/lib/class_wdsi_mailchimp.php' (include_path='.:disappointed:usr/share/pear:disappointed:usr/share/php') in /var/www/vhosts/moneyweekdev.com/releases/20131001205139/wp-content/plugins/slide-in/loader.php on line 56

Please help,
Thanks