I’m sorry but it looks like the twitter widget api has some issues with the theme. Kriesi stated, “Hey! It seems twitter has also deprecated this way of getting the feed, thats the caue of the error. at this point it is no longer possible to easily retrieve a follower count without complicated authentication. Something which I dont wont to add to the theme itself, so I recommend to search for a plugin that can do that….”
You might need to use a separate twitter plugin for now.