API access using pyechonest always returns [HTTP 403]

Hi,

I am trying to use pyechonest to build a basic webapp using Django web-framework. My python code works on my local machine but in production, the pyechonest api access always returns [HTTP 403] error. Could anyone help me with this please?

The python code is as follows

from pyechonest import song
search_results = song.search(title='title of the song')

I have set my Echonest API key correctly.

Thanks.