Server Error 502 Bad Gateway

[Suellen]

Hello, 

Estou a ter o erro 502 no site. (store.hp-drones.com)
O erro ocorre assim que o cliente faz o login no site (https://store.hp-drones.com/pt/autenticacao?back=my-account).

Já tentei todos os procedimentos básicos para resolver o erro, mas sem sucesso. 

Erro apresentado em modo de debug:

Warning: Declaration of Cart::updateQty($quantity, $id_product, $id_product_attribute = NULL, $id_customization = false, $operator = 'up', $id_address_delivery = 0, ?Shop $shop = NULL, $auto_add_cart_rule = true, $skipAvailabilityCheckOutOfStock = false, bool $preserveGiftRemoval = true) should be compsiteatible with CartCore::updateQty($quantity, $id_product, $id_product_attribute = NULL, $id_customization = false, $operator = 'up', $id_address_delivery = 0, ?Shop $shop = NULL, $auto_add_cart_rule = true, $skipAvailabilityCheckOutOfStock = false, bool $preserveGiftRemoval = true, bool $useOrderPrices = false)

Se puderem ajudar, please! 

Obrigada!

Error screenshot

Error 502

 

Edited March 5 by Suellen (see edit history)