I'm calling the ListSubscribe part of the API with this json data:

{"apikey":"XXX-us2","id":"XXXXX" ,"email\_address":"joe@gmail.com","double\_optin":false,"merge\_vars":{"GROUPINGS":{"name":"Lectures","groups":"Lecture"}}}

and I'm getting back:

```
{"error":"\"L\" is not a valid Interest Grouping id for the list: members-announ
ce","code":270}

```

However, when I use id rather than name I get pretty much the same response (the docs say both are usable). I can get things to work if I leave out the GROUPINGS call.

The following is the enumeration of the groupings:
 result: 

```
[{"id":11941,"name":"Lectures","form_field":"hidden","display_order":"0","groups
":[{"bit":"1","name":"Transit of Venus Wellington 12 June 2012","display_order":
"1","subscribers":1},{"bit":"2","name":"Transit of Venus Auckland 14 June 2012",
"display_order":"2","subscribers":1},{"bit":"4","name":"Lecture","display_order"
:"3","subscribers":0}]}]

```