BeTheme posts cannot be edited with WP 5.2.4/Gutenberg

I'm running Wordpress 5.2.4 on my website and have installed BeTheme 21.4.2. After installing the theme I've installed the Demo Blogger2.
Now I try to create my own content and want to look into the existing posts of Blogger2. But when looking at post and clicking Edit Post in the WP navigation the (Gutenberg) editor opens, I see the title of the page and below an error message: "an error occurred in this block, preview is not possible" (I had to translate this to English) and nothing else.
What is incompatible with what among Wordpress 5.2.4, its Gutenberg editor, the BeTheme and its Muffin Builder?

Note: editing the start/home page of Blogger2 is no problem.

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