HTTP Error 404

[tvinci]

Why is this happening?

[GreenFlux]

Is this on mobile or in the browser?

If you can replicate the error in the browser (full screen, not in the editor), then copy/paste the URL here for troubleshooting.

Also, what were you doing just before? Is this following an action button press, or form save? Are workflows involved?

[tvinci]

The problem fixed itself when I refreshed the page but it was on browser.