Google Search Console - AMP issues detected

I have recently gone about getting my website listed on google and signed up to google search console.

I have received an email saying: AMP issues detected, Error in required structured data element referring to this page: https://www.nural.cc/welcome-to-nural/amp/

Does anyone know how to resolve this?

My website url: nural.cc
I am using Ghost pro with a custom cobalt lyra theme sourced from this forum: Meet Lyra Cobalt. A wonderful cobalt theme