Uncaught error blocking store access

[kauaianken]

We're back again with more tweaks needed on our starmen.com/shop site.

The site is showing a blank page (white screen) on the shop page, and there is no file when looking for pagesource.

This occurred after updating the security certificate, which makes no sense.

The error log (below) shows an issue with one of the addons:

[30-Mar-2023 19:18:24 UTC] PHP Deprecated:  Function get_magic_quotes_gpc() is deprecated in /home/starmen/public_html/shop/config/defines.inc.php on line 143 [30-Mar-2023 19:18:24 UTC] PHP Fatal error:  Uncaught Core_Foundation_IoC_Exception: This doesn't seem to be a class name: `Adapter_EntityMapper`. in /home/starmen/public_html/shop/Core/Foundation/IoC/Core_Foundation_IoC_Container.php:95
Stack trace: #0 /home/starmen/public_html/shop/Core/Foundation/IoC/Core_Foundation_IoC_Container.php(157): Core_Foundation_IoC_Container->makeInstanceFromClassName('Adapter_EntityM...', Array) #1 /home/starmen/public_html/shop/Core/Foundation/IoC/Core_Foundation_IoC_Container.php(170): Core_Foundation_IoC_Container->doMake('Adapter_EntityM...', Array) #2 /home/starmen/public_html/shop/Adapter/Adapter_ServiceLocator.php(52): Core_Foundation_IoC_Container->make('Adapter_EntityM...') #3 /home/starmen/public_html/shop/classes/ObjectModel.php(232): Adapter_ServiceLocator::get('Adapter_EntityM...') #4 /home/starmen/public_html/shop/classes/shop/Shop.php(131): ObjectModelCore->__construct('1', NULL, NULL) #5 /home/starmen/public_html/shop/classes/shop/Shop.php(400): ShopCore->__construct('1') #6 /home/starmen/public_html/shop/ in /home/starmen/public_html/shop/Core/Foundation/IoC/Core_Foundation_IoC_Container.php on line 95
 

I will greatly appreciate any help or suggestions from this august body.
Thanks in advance,
Ken

[kauaianken]

The site uses Prestashop 1.6 and PHP 7.1.

Also, the backoffice dashboard is not available (shows a "white screen", too)...