Redmine

Following How to install of redmine on fedora 29
https://www.redmine.org/projects/redmine/wiki/Install_Redmine_on_Fedora
in two separate installation by separate people, we always get

Redmine 500 error / Internal error with appropriate notice to check redmine logs,
and well the problem is there is no error.

Reproducible always latest fedora 30 redmine 4.0.4/passenger 6.0.2/nginx 1.6.0

In all cases ruby server on port 3000 works

At the end I started all as a root and I got some interesting files in /opt/nginx/logs
that I would not expect to see, you see them bellow
rw-r--r-. 1 root root 145 Jul 16 11:13 access.log
rw-r--r-. 1 root root 7105 Jul 17 09:50 error.log
rw-r--r-. 1 root root 0 Jul 17 22:42 'javascript_history.back()mine 500 error'
rw-r--r-. 1 root root 0 Jul 17 22:42 'javascript_history.back() on the page you were trying to access.'
rw-r--r-. 1 root root 5 Jul 16 11:12 nginx.pid

I did nothing anything useful in logs , but ruby server standalone works fine,
but with this combination nginx(web server)->passenger(web) server->ruby(opet web server)
we always get same problem.

just to mention selinux was off.

Any idea what could be wrong?

Thank you,

Zoran