ERROR: No card found (Card error)


I keep getting a ERROR: No card found (Card error) when I try to validate my card.

This is the URL:

Here are the meta tags:

meta name=“twitter:card” content=“summary_large_image”
meta name=“twitter:title” content=“Shrinking Down Soft Robots”
meta name=“twitter:image” content=“
meta name=“twitter:description” content=“A novel manufacturing process opens the door for tiny, complex, soft robots”


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