How can I use the Json class?

I've tried various permutations and combinations of:


r := (WebClient httpGet: 'http://localhost' )content.
r := MultiByteBinaryOrTextStream on: r encoding: nil.
Json readFrom: r.

where localhost/index.html is:

{ "glossary": { "title": "example glossary", "GlossDiv": { "title": "S", 
"GlossList": { "GlossEntry": { "ID": "SGML", "SortAs": "SGML", 
"GlossTerm": "Standard Generalized Markup Language", "Acronym": "SGML", 
"Abbrev": "ISO 8879:1986", "GlossDef": { "para": "A meta-markup 
language, used to create markup languages such as DocBook.", 
"GlossSeeAlso": ["GML", "XML"] }, "GlossSee": "markup" } } } } }



taken from http://json.org/example.html

I get MNU: undefonedObject>>isSeparator.


Help?


Thanks.

Lawson