BO - impossible to read order, to make a PDF with invoices

[shana0780]

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

Edited December 25, 2019 by shana0780 (see edit history)

[shana0780]

up, nobody can help me ?

I suppose I have to change the code to the file paypal_order but I don't know how 

[shana0780]

Resolved for me, I have only downloaded another version of Paypal.