Prestashop 1.7.7. Error When Proceed to Checkout - prestashop

Question

Like I explain at the title this issue it's related with the checkout of prestashop version 1.7.7.0.
When I add I product to the cart, and then I press the button to proceed to the checkout I have this issue:
[21-Jun-2021 22:39:57 Europe/Madrid] PHP Fatal error: Uncaught Error: Call to undefined method Cart::checkAllProductsAreStillAvailableInThisState() in /home/public_html/classes/checkout/CheckoutPaymentStep.php:48
Stack trace:
#0 /home/public_html/classes/checkout/CheckoutProcess.php(59): CheckoutPaymentStepCore->handleRequest(Array)
#1 /home/public_html/controllers/front/OrderController.php(278): CheckoutProcessCore->handleRequest(Array)
#2 /home/public_html/classes/controller/Controller.php(306): OrderControllerCore->initContent()
#3 /home/public_html/classes/Dispatcher.php(518): ControllerCore->run()
#4 /home/public_html/index.php(28): DispatcherCore->dispatch()
#5 {main}
thrown in /home/public_html/classes/checkout/CheckoutPaymentStep.php on line 48
I have made some test:
Disable all the modules and have only to the native ones of Prestashop.
Tried with a clean install and always i have the same problem.
No matters if it's the default theme or the bought one.
Delete the cache of prestashop...
Clearly i'm desesperate with this problem... Any help will be so apreciate.

Answer 1

Hello again for all the community,
I have solve the problem by commenting some lines of code.
Get this archive and edit it.
Classes > Checkout > CheckoutPaymentStep.php
public function handleRequest(array $requestParams = [])
{
$cart = $this->getCheckoutSession()->getCart();
$allProductsInStock = $cart->isAllProductsInStock();
//$allProductsExist = $cart->checkAllProductsAreStillAvailableInThisState(); /*-- Comment this --*/
//$allProductsHaveMinimalQuantity = $cart->checkAllProductsHaveMinimalQuantities(); /*-- Comment this --*/
//if ($allProductsInStock !== true || $allProductsExist !== true || $allProductsHaveMinimalQuantity !== true) /*-- Change this one --*/
if ($allProductsInStock !== true) {
$cartShowUrl = $this->context->link->getPageLink(
'cart',
null,
$this->context->language->id,
[
'action' => 'show',
],
false,
null,
false
);
Tools::redirect($cartShowUrl);
}
if (isset($requestParams['select_payment_option'])) {
$this->selected_payment_option = $requestParams['select_payment_option'];
}
$this->setTitle(
$this->getTranslator()->trans(
'Payment',
[],
'Shop.Theme.Checkout'
)
);
}
For now all goes well and we can process to the checkout. Hope if someone have the same problem, could help you.
Nancy.