I keep a lot of local HTML files on my machine, including my home page. Whenever I first open Safari, and often when going to any local file, I will receive an error. Hitting refresh (or, for the home page, the home button again) fixes the problem... until the next time you try to go anywhere.
Usually opening a link in a new tab prevents this from occurring; opening a link in the same tab almost always sees the error.
I realize "wait for Apple to get around to fixing it" is a valid answer; I also realize "use a different browser" is a valid answer. I'm hoping, instead, for a setting change I can make, or HTML tag I can add to my metric badger-load of files, to prevent this error without swapping browsers or waiting for an update (since it's already been happening for quite some time).
Safari Can't Open the Page
Safari can't open the page. The error is "The operation couldn't be completed.
(kCFErrorDomainCFNetwork error 1.)" (kCFErrorDomainCFNetwork:1)
Some potentially useful information:
macOS Mojave Version 10.14.4 (On a desktop, if that matters.)
Safari Version 12.1 (14607.1.40.1.4)