doxadigital on "My First REST Get request failed"

Hello,
i'm leaing WP-API now... i had a test site which is
http://project.doxadigital.com/motomaxx/

i got an article with ID 250, but if i call through here:
http://project.doxadigital.com/motomaxx/wp-json/wp/v2/posts/250

it retus:
{"code":"rest_no_route","message":"Tidak ada rute yang sesuai dengan metode URL dan permintaan","data":{"status":404}}

Any idea what went wrong ?

Thanks