Yoast SEO Copatibility

Hello.
I am trying some SEO in my pages (gulliver.gr) using Yoast SEO.
I have used only the Be Theme Muffing Builder modules where I have pte some text and also text in the footer widget.
But in the Yoast Analysis I get "Text length: The text contains 0 words. This is far below the recommended minimum of 300 words. Add more content.".
Is it a compatibility problem?
Any suggestions?

Thank you
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