ERROR at checkout: 0 Class "JArrayHelper" not found

-- HikaShop version -- : 4.7.5
-- Joomla version -- : 4.3.3
-- PHP version -- : 8.0.30
-- Browser(s) name and version -- : Chrome Version 115.0.5790.170 (Official Build) (x86_64) (also happens with all other browsers tried)
-- Error-message(debug-mod must be tuned on) -- : 0 Class "JArrayHelper" not found

Migrating using MigrateMe4

With your help i was able to update the public store, a near copy, to J4 after removing email customizations. I did so on this site as well but get this error at final checkout

0 Class "JArrayHelper" not found

That appears in Chrome browser tab, otherwise i see my 404 page.

Jooomla 4.3.3
PHP 8.0.30
Hikashop 4.7.5
Hikamarket 4.1.1

I read that OSMap could cause issues, so I've uninstalled all pieces.

I uninstalled the XMap plug as well

What have i missed??? Thanks...

Here is the full info