Twitter card validator shows 'Unable to render Card preview'

[SealDebprotim]

Hi,

Few months back following pages were working fine on twitter card validator, but today we noticed that they are failing:

Jason Hsu

John West

Chris Brightman

And strangest issue is for the following URL the validator is showing description which is not even there:

Rob Arnott

Can someone help me with this? I checked few of the blogs but everything told over there already exists in my pages.

[CastineDesigns]

I did not see any meta tags listed on these pages. I would say it is not a good practice to have folders or files with spaces in them. So the folders should be “Our-firm/Our-Team” instead.

[SealDebprotim]

How did you check that? When I check the page source I can find all the meta tags intact. Just find twitter as a keyword.