CSS error on plugin activation

Every time I try to use this plugin with my site – http://meetingpier.com it displays this error message “/MEETINGPIER/wp-content/plugins/buddymobile/includes/bp-mobile-class.php on line 41”

how do I resolve this? Any ideas 🙂

https://wordpress.org/plugins/buddymobile/