AH01071: Got error 'PHP message: PHP Fatal error: Uncaught Error: Call to undefined method Configuration::getMultiShopValues()

[BartekPrintSoft]

Hello, I have a problem with PrestaShop.
My store isn’t working, and I’ve already tried many fixes but nothing has helped so far.
Here’s the error message I’m getting:

AH01071: Got error 'PHP message: PHP Fatal error: Uncaught Error: Call to undefined method Configuration::getMultiShopValues() in /var/www/vhosts/suwmet.pl/suwmet.pl/classes/shop/Shop.php:399
Stack trace:
#0 /var/www/vhosts/suwmet.pl/suwmet.pl/config/config.inc.php(118): ShopCore::initialize()
#1 /var/www/vhosts/suwmet.pl/suwmet.pl/index.php(27): require('/var/www/vhosts...')
#2 {main}
  thrown in /var/www/vhosts/suwmet.pl/suwmet.pl/classes/shop/Shop.php on line 399
Can you please help me figure out which file or issue is causing this and how to fix it?

[ComGrafPL]

Any updates, changes before issue? Presta and PHP version? 

[BartekPrintSoft]

I haven’t updated Prestashop myself — my boss made some changes on the hosting. However, the PHP version has been 7.4.33 for a long time, and it was working fine. I know it’s an old PHP version.

[El Patron]

1 hour ago, BartekPrintSoft said:

I haven’t updated Prestashop myself — my boss made some changes on the hosting. However, the PHP version has been 7.4.33 for a long time, and it was working fine. I know it’s an old PHP version.

Confirm your exact PS version