I've installed the version 3.2.8 of the JM Twitter Cards Plugin, wordpress version 3.6, and looking at the source code for the website it all looks OK. The twitter card meta tags look fine.
However, when I try to use the the twitter validator so that I can get the site approved I just get the following error
Sorry, looks like we're having technic
I tried the validator on some sites that are showing twitter cards on twitter and the validator works fine.
The site is
Any ideas what might be wrong and what I can do about it?