OnlineShop nicht mehr erreichbar (500 Server-Error)

[joeker]

Hi guys

I have a problem with the onlineshop on a customer system. Prestashop (v. 1.6) on this system is not more reachable. The debug mode tells me the following message:

Fatal error: Class 'DbQuery' not found in /mnt/web006/e0/01/57556201/htdocs/onlineshop/Adapter/Adapter_EntityMapper.php on line 46 

I tried to edit this file and include the missing class like this:

include_once(_PS_CLASS_DIR_.'db/DbQuery.php');

Then I renamed the calling class 'DbQuery' into 'DbQueryCore' (origin class name in this file). After them Prestashop says the class 'Cookies' is not defined and  so on.

Maybe, could the reason of this problem the integrated class initialization of Prestashop? Have someone a hint or a suggestion for me?

Edited November 19, 2018 by joeker (see edit history)

[joeker]

I find the right solution for me:

I updated PHP to Version 7 and deleting the file cache/class_index.php from server.

Edited November 20, 2018 by joeker (see edit history)