HELP ! Prestashop 1.7.4.2 classes/Category.php modified Error 500

[riccardopannocchia]

To sort the categories in product associations in BO, I modified a query in the classes/Category.php file (I changed ORDER_BY),

when I replaced the modified file on the server I received error 500, so I put the original file back but still error 500,

I put prestashop in debug mode now I can see the site again both in front and in BO but when I insert a new product I get an error

Notice: Undefined property: Product :: $ no_discount.

I have read to delete the app / cache / dev / class_index.php and var / cache / prod / class_index.php files, can this solve the problem?

 

 

Error :

 

[26-Jun-2019 14:53:12 Europe/Malta] PHP Fatal error:  Uncaught Error: Class 'Category' not found in /public_html/classes/Product.php:4653
Stack trace:
0 /public_html/classes/Cart.php(804): ProductCore::getProductProperties(2, Array)
1 /public_html/src/Adapter/Cart/CartPresenter.php(278): CartCore->getProducts(true)
2 /public_html/classes/controller/FrontController.php(495): PrestaShop\PrestaShop\Adapter\Cart\CartPresenter->present(Object(Cart))
3 /public_html/classes/controller/FrontController.php(544): FrontControllerCore->assignGeneralPurposeVariables()
4 /public_html/controllers/front/PageNotFoundController.php(42): FrontControllerCore->initContent()
5 /public_html/classes/controller/Controller.php(255): PageNotFoundControllerCore->initContent()
6 /public_html/classes/Dispatcher.php(428): ControllerCore->run()
7 /public_html/index.php(28): DispatcherCore->dispatch()
8 {main}
  thrown in /public_html/classes/Product.php on line 4653

Edited June 27, 2019 by riccardopannocchia (see edit history)