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This is a known issue. The error shop_uuid must be a string. shop_uuid should not be empty pops up when the PrestaShop Marketplace module can't find or generate a valid shop UUID. Lots of folks are seeing this on PrestaShop 8.x.

• It’s all due to changes in how PrestaShop identifies shops (the shop_uuid), especially after upgrades or when things get out of sync.
• There’s no official fix yet, but sometimes resetting or reinstalling the Marketplace module, and clearing /var/cache and /modules/ps_marketplace, might help (no promises!).
• Track or report the issue here: https://github.com/PrestaShop/PrestaShop/issues/35592

Some friendly advice (learned the hard way by many admins):
If your shop is running smoothly, resist the urge to update just because there’s a shiny new button. PrestaShop isn’t the most stable platform for constant tinkering—every change is a roll of the dice.
Best practice: always make changes on a development copy of your shop first. If you break your test site, you just lose your weekend, not your sales!

Lock it down, focus on selling, and save the upgrades for when you really need them. Your future self will thank you. 😄

attached  is a pdf of how you can try to solve:

prestaheroes_fix_shop_uuid_error.pdf