Set Safari URL No Longer Working

[peternlewis]

My guess is you are being bitten by the Sonoma menu system bug:

Select or Show a Menu Item action issue with Sonoma

OK, yes, this is basically the same issue. Sonoma for some (all, many, most, a few, I'm not sure) menus returns error -6520 menuNotFoundErr for menus it clearly finds. So selecting Safari File ➤ New Window, works, but then returns menuNotFoundErr. And trying to shoe Safari File ➤ Export fails with the same error. So I would guess Apple has to work to do to resolve this. It's pretty repeatable, and the menu system is all new, so hopefully they will actually resolve it. Otherwise eventually I'll…

And so your macro is probably stopping after the File ➤ New Window menu selection. Turn off reporting and aborting of the action when it errors (the system reports an error even after performing the menu).