I cannot seem to get the id of a hostgroup through the API:

Sending:{"jsonrpc":"2.0","method":"hostgroup.getId","id":0,"auth":"f5cdd64f276ca0de9c117a1ade132976","params":{"name":"Templates"}}

array(3) {
["jsonrpc"]=>
string(3) "2.0"
["error"]=>
array(3)

{ ["code"]=> int(-32602) ["message"]=> string(15) "Invalid params." ["data"]=> string(29) "Action (getId) does not exist" }

["id"]=>
int(0)
}