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Hello,

I've made an upgrade of Prestashop (1.6.1.8 to 1.7.6.2.) and when I've downloaded the module Paypal, it's no more possible to see the orders and to download invoices in the back-office.

In the frontend, it's impossible to order something.  At the end of the cart, when I click on order, I have an error.

If the module Paypal is desactivated, I have no problem.

Can you help me ?

Additional information
PrestaShop version: 1.7.6.2
PHP version: 7.2