Unable to render Card preview - need help with summary card


Hi, can someone please help with a Twitter Summary Card installation, I’m a non-dev and the steps seemed pretty easy.

I was able to create the tags on my website and get the Twitter Card Validator to give me some results, but I’m not sure what to make of them, and I tested the Card on Twitter and the card did not display.

Here’s a screenshot of the error msg and the code I created for www.slashchordgame.com. If anyone can point me in the right direction that’s be great, thanks!

Slash Chord App By Slash Games Home


For some reason the meta tags aren’t displaying in my above post, you can see them here: