ERROR: Invalid Value



I’m currently implementing Twitter Cards on our website, The card validator has worked fine for several asset types, but photo galleries through our CMS (BLOX, via TownNews) are giving the following error when run through the Validator:

INFO: Page fetched successfully
INFO: 19 metatags were found
INFO: twitter:card = summary_large_image tag found
ERROR: Invalid value (message: Field description failed to validate because: text expects tag property, but not found in Map().)
WARN: Not whitelisted

Here’s the URL that’s giving this error:

Thanks for the assistance!