PrestaShop 1.7 -> AH01071: Got error 'PHP message: PHP Fatal error: Uncaught Error: Class 'Tools'

PrestaShop 1.7.6.0 has the problem with Server Plesk Onyx ver 17.8.11 CentOS Linux 7.6.1810 and FPM.

Shop Parameters -> Traffic & SEO -> Set up URLs -> Save
Blank Page Error 500

Advanced Parameters -> Performance -> Clear Cache
Blank Page Error 500


The error with Plesk 17.5.3 and 17.8.11 occurs with FPM served by Apache, using FastCGI, prestashop does not generate the error. How to solve and use FPM?

Error Apache
AH01071: Got error 'PHP message: PHP Fatal error: Uncaught Error: Class...

PrestaShop 1.7 -> AH01071: Got error 'PHP message: PHP Fatal error: Uncaught Error: Class 'Tools'