PHP-FPM Cannot Get UID For User

I have setup an AWS EC2 linux instance and installed the following:

httpd24 php71 php71-fpm php71-mysqlnd mod24_ssl fcgi mod24_fcgid

I am wanting to run apache 2.4, php 7.1 and php-fpm. In the below error I am also not understanding what 'nginx' is trying to do, I didn't think I had installed anything to run on nginx, if I am running apache.

ERROR: [pool www] cannot get uid for user 'nginx': Success (0)

In php-fpm.conf, uncommented I have this

pid = /var/run/php-fpm/php-fpm-7.1.pid

In my php-fpm.conf I do not see

user = apache
group = apache

But I do see them in /etc/php-fpm.d/www.conf

Can somebody please help me sort this out.

Thank You

Resolved found in the /etc/php-fpm.d/www.conf, I found this line.

listen.acl_users = apache,nginx

Solution - change to

listen.acl_users = apache