This error has been since resolved.

A help article has been made on the groupType page: http://help.getbraincloud.com/en/articles/3272656-design-groups-group-types

If experience similar problems to this forum topic with our Unity library, ensure brainCloud has been added to a gameObject, and that gameObject is not disabled.

Follow-up on this...

My guys have looked into it, and the way we version our global files isn't compatible with this new feature from Unity. Apologies!

(PS - No plans yet for when/if we'll support it. Certainly tons of folks use an external CDN with brainCloud apps though - so the option is still there for you!)