Param is missing or the value is empty on POST request to api

Question

I've downloaded this repo (api-presentation) to experiment with api in rails app.

Here's an article with video that explains what is api and how to use it.... http://www.aomran.com/designing--building-restful-json-apis/

Now I'm trying to add a record through POST request with Postman extension and I'm geting:

param is missing or the value is empty: contact

What am I doing wrong?

Here's a screen with the error:

Answer 1

I added Header/Value and it worked for me. The question's probably lame.