[Plugin: Buddypress Auto Group Join] Had to change: function groups_are_active()

It was telling me to configure Groups at BP Components, but this was already selected. I had to make this change to get it working.

function groups_are_active() {
return bp_is_active( ‘groups’ )? true : false;
}

http://wordpress.org/extend/plugins/buddypress-auto-group-join/