Advanced layout editor doesn't work any longer

I’m an ophthalmic surgeon. Bought a Enfold Child theme webside some years ago for promoting my clinic. I normally publish a new blog once a week. Latest ordinary such blog is Januari 31 2018.
From that date I can’t edit the blog with advanced layout editor any longer. So the latest blog I had to manually put in HTML-codes but I’m not able to put in Keyword and this was only possible with the classic editor plugin activated. If I deactivate this plugin I cant edit anything at all just get a page with a lot of lines ending with FATAL ERROR

Anything I can do to make it work again?
My webside is:



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