'{"params": {"gui_access": "0", "users_status": "0", "debug_mode": 0, "name": "omnitracker_managed_users"}, "jsonrpc": "2.0", "method": "Usergroup.create", "auth": "485e3f76ebab4682d7bb31d24bac6e27", "id": 2}'
Answer:
{u'error': {u'code': -32500,
            u'data': u'Only Super Admins can delete user groups.',
            u'message': u'Application error.'}