You might be having some troubles with file permissions!
I’m setting a new small vps for some tests and I got this…
/var/log/php-fpm/www-error.log
PHP Warning: touch(): Unable to create file ./cache/index.html because Permission denied in
Centos 7
nginx
PHP 7.3.3 PHP-FPM
My PHP-FPM running under apache user instead of nginx on /etc/php-fpm.d/www.conf