[Plugin: JSON API] Custom Post Types Wp Ecommerce

I’m trying to see the json data from wp ecommerce custom post type wpsc-products and for some reason it wont show. I can see the data for a regular post. Anyone have any idea how to grab that?

Here is what I’m using

?json=get_post&post_type=wpsc-product&post_id=1196

http://ww.wp.xz.cn/extend/plugins/json-api/