Internal server error 500PayPal & Braintree official Module 4.4.2

[medaliskr]

i have installed and configured PayPal & Braintree official Module 4.4.2 , but  I can't go at the end of the purchasing procedure, because on cart page I get an Internal server error 500 !!

and  whene i got this error after enabled the debug mode and don't now id related to the instaltion of the papal module

im using prestashop 1.7.4.2

my shop url : http://prestashop-demo.u308051739.hostingerapp.com/en/

 

please any ideas