I’m building a custom footer. This footer should be applied to all pages. So I went home on my site, I created a line with two columns, and made customization as I wanted.
Dai went and clicked to save GLOBAL.
This customization applied to all pages.
But there I was again at home to edit something I had forgotten, I clicked the module I saved and I tried to edit the line and gave an error saying that the page does not exist: Sorry! That page does not seem to exist.
I have experienced the same issue on a clean install of WP. I had permalinks set to postname but was getting the sorry page does not exist when trying to edit global row. I went into settings / permalinks and clicked save-changes and the problem was resolved.