Membership 2 Pro - Class not loaded: woocommerce

We are having an issue with our site when people are subscribing to one of our memberships. We are getting an error after entering the CC info that is "Class not loaded: woocommerce". We are not using woocommerce and have never had it installed, so we aren't sure why it's trying to call that class. Any ideas how we can get our checkout working again without woocommerce?