GenStage and twitter stream

Hi! I was trying out the twittex from the blog. But I got stuck on authorization error. I have set the config

config :twittex, 
consumer_key: "xxx", 
consumer_secret: "xxxx", 
token: "xxx", 
token_secret: "xxx"

but it keeps getting stuck when it tries to do a post to the https://stream.twitter.com from the repo. =(

I want to learn to create a streaming api client. =(

Thanks!