sending a host creation request returns an error about user group creation. furthermore, current user actually is zabbix superadmin.

{"auth":"8b7483a0a94205159da9fa07c67f8740","method":"host.create","id":14,"params":{"groups":[

{"groupid":1}

],"host":"Server 12"},"jsonrpc":"2.0"}

{"jsonrpc":"2.0","error":

{"code":-32500,"message":"Application error.","data":"[ CHost::create ] Only Super Admins can add User Groups"}

,"id":14}