Membership Error After Upgrade

I’m getting this error after my update:

Warning: Missing argument 2 for wpdb::prepare(), called in D:WebRootDomainsgimpedtutorials.comwwwrootwp-contentpluginsmembershipmembershipincludesclassesmembershippublic.php on line 2312 and defined in D:WebRootDomainsgimpedtutorials.comwwwrootwp-includeswp-db.php on line 990

It’s displaying on my website as well. How do I fix this?