Twitter Card (photo) is showing error in the validator tool, but all tags are valid


I’m trying to add twitter card support for our own image server. Currently the meta tags are like:

<meta name="twitter:card" content="photo">
<meta name="twitter:site" content="@FotoDish">
<meta name="twitter:creator" content="@FotoDish">
<meta name="twitter:title" content="FotoDish">
<meta name="twitter:image:src" content="">
<meta name="twitter:domain" content="">

as in .

However, the validator tool shows error, while all single items are valid.

Twitter Validator Tool result:

What is the issue?

Thank you!


We cannot reach your file, and therefore the Twitterbot cannot fetch the photo to render the card. Please see this link for more info: