vagrant virtualbox can't start nginx

[An Nguyen]

Hi, I've a vagrant virtualbox per
http://socorro.readthedocs.io/en/latest/development/dev-services.html#set-up-a-vm-with-vagrant

but it can't start nginx per http://socorro.readthedocs.io/en/latest/production-install.html#installing-services

[vagrant@localhost ~]$ sudo systemctl start  nginx

Job for nginx.service failed because the control process exited with error code. See "systemctl status nginx.service" and "journalctl -xe" for details.

[vagrant@localhost ~]$ systemctl status nginx.service

● nginx.service - The nginx HTTP and reverse proxy server
   Loaded: loaded (/usr/lib/systemd/system/nginx.service; enabled; vendor preset: disabled)
   Active: failed (Result: exit-code) since Fri 2016-08-12 00:43:42 UTC; 47s ago
  Process: 17873 ExecStart=/usr/sbin/nginx (code=exited, status=1/FAILURE)
  Process: 17871 ExecStartPre=/usr/sbin/nginx -t (code=exited, status=0/SUCCESS)
  Process: 17870 ExecStartPre=/usr/bin/rm -f /run/nginx.pid (code=exited, status=0/SUCCESS)

thanks for any ideas!
An.