Unfortunately, the install had in fact been adjacent to my needs, because instead of the theme being installed on the staging site instead of the live site as I had requested, it was installed — and activated — on only the live site…which now has a problem, and I’ve been unable to resolve it: when I click on any individual portfolio item, the theme loads a blank page (desktop view), or (mobile view) it loads a page that says:
There has been a critical error on this website. Learn more about troubleshooting WordPress.
How can this be repaired?