Getting error while editing single post element

When I try to edit the “Template – Single Post” I get this error message:

“Your site doesn’t include support for the “generateblocks/text” block. You can leave it as-is, convert it to custom HTML, or remove it.”

See screenshot. What I’d like to update is I don’t want to the cartoon girl behind “Related Posts”

https://i.postimg.cc/XNQbBVHT/Screenshot-2026-04-07-at-12-25-56-PM.jpg

Thanks!