Fatal error bp-members-notifications.php

My site (missionstarter.org) is displaying this error:
Notifications
Fatal error: Cannot access empty property in /home/justinjdean/missionstarter.org/wp-content/plugins/buddypress/bp-members/bp-members-notifications.php on line 76

I tried reinstalling BuddyPress, deactivating plugins, etc and can't figure it out. Any help?