Twitter cards on Tumblr not working


#1

The tags for Twitter cards are in the code of my Tumblr site http://bizaaron.tumblr.com but the cards are not showing in Tweets containing link posts to my Tumblr. I tried validating one of my URLs and it is telling me it does not work because it is denied. How can I get my Tumblr posts to show cards when posting them to Twitter?

Thanks!