When I activate the membership plugin i'm receiving this

When I activate the membership plugin i'm receiving this error

Fatal error: Cannot redeclare set_membership_url() (previously declared in /home/fro1/public_html/upnpowerblog.com/wp-content/plugins/membership/membershipincludes/includes/functions.php:136) in /home/fro1/public_html/upnpowerblog.com/wp-content/themes/list-machine-pro/membership/includes/functions.php on line 94

Is there a way to fix this?