'Unable to render Card preview' Error



I am trying to validate my card for Twitter with the URL http://freshfootball.co.uk/

and am getting the error message

Unable to render Card preview
ERROR: internal sever error

How can I solve this? I used JM Twitter Cards to help set up and the META tags are in my source code


I’m experiencing the same issue. In the details it’s saying that it’s able to pull the page, but saying that there were no meta tags - but my code injection on Squarespace seems to be placing the correct metatags in there as required.