I was trying to use the card but I had no luck. I have all proper meta tags on http://ipractical.16mb.com
I just tried fetching your page in a browser, and was presented with a password pop-up.
I tried using
curl -A Twitterbot and I see some
<meta> tags but there is no closing
<head> and your HTML is badly-formed.
The validator is unable to fetch your page.
Please see this topic for the steps to take before asking further questions here.