Error creating JSON with JsonArray

I am trying to create a json array like the one from DataTables.net.

Set oJ = Server.CreateObject("Chilkat_9_5_0.JsonArray")
Response.Write oJ.version       'returns 9.5.0.58
s = oJ.AddArrayAt(-1)       'returns 0

'   First Child
Set oChild = oJ.ArrayAt(0)
Response.Write TypeName(oChild)       'returns 'Nothing'