7.1 Group Error Urgent Help Please

Since Updating to 7.1 new users can no longer join my old groups just keep saying Access denied what could be the problem ive check the moderation setting on the groups to see if there still public and the join is still open without request but still problem joining

Ive also Tried Making New Group And same Error appers when trying  to join group

Ive set a Public Test Group Feel Free To Try It Out

NOW CLOSED Here or http://scarletnetworks.com 

Also Just tried adding new group to featured list and same error

Ive tried number of thing to fix the problem last ting i tried was to remove the groups module from the module panel in the admin page and when it came to reinstalling the groups modular it will not install and i just get error

Installation of: Groups Failed -- Check the Dolphin version for compatibility: The module is not compatible with your version of Dolphin script