Internal Error with our Twitter Cards


Hello guys,

We have had some consistent “internal errors” while trying to validate our Twitter cards & we are not sure why. We have setup Twitter cards before (for a different site) & we set these up the exact same way. We run a Wordpress site & use the “JM Twitter Cards” plugin. Below is a sample link we have tried to validate:

Any idea as to why we are getting this error? Any feedback would be appreciated.
Thank you.