Reported here. Another editor who's been using the editor for quite a long time, had to disable it completely just to be able to edit Ukrainian Wikipedia.
The editor will now load. If you still see this message after a few seconds, please reload the page.
I'm seeing this message while trying to open a red link. After I click the "reload the page" link, it works fine, but having to do that all the time is frustrating. Besides, as I mentioned on the talk page (see the link above), I'm having problems with using HotCat in ukwiki: after I press the "reload the page" link, I get a message that "This site can't be reached", so that I have to either edit categories manually, or switch the 2017 editor off just to be able to use HotCat.