I'm trying to run BuddyPress Group Calendar on just a single sub site in a multisite network. I see that the plugin was only 'network active', so I tried changing that to 'Network: false'. I also updated the database prefix from 'base_prefix' to just 'prefix'. I deactivated and activated the plugin, however when I go to post a group calendar event it says "There was a problem saving to the DB". Please advise on how I can make this work for a single sub site.