ubuntu configuration error url not found

I am trying to install ProcessMaker [open source app] on a VPS with ubuntu. I have everything installed and followed the instructions closely, but now when I go to it

(http://95.85.12.123/ or promak.lfwebz.net

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) I get this error "The requested URL / was not found on this server."

I think the issue is in this

pmos.conf

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file [see below]http://wiki.processmaker.com/index.php/2.0/ProcessMaker_Ubuntu_Installation, but I am certain I have everything correct, based on the instructions here: http://wiki.processmaker.com/index.php/2.0/ProcessMaker_Ubuntu_Installation

Does anyone know what I can change, check, update? Any help would be appreciated.

Note: i have restarted apache after various changes.

root@promak:/opt/processmaker/etc# sudo nano pmos.conf
  GNU nano 2.2.6                       File: pmos.conf

# Please change the ip address with your server ip address and
# the ServerName with you own subdomains.

NameVirtualHost 95.85.12.123

#processmaker virtual host
<VirtualHost 95.85.12.123 >
  ServerName "promak.lfwebz.net"
  DocumentRoot /opt/processmaker/workflow/public_html
  DirectoryIndex index.html index.php
  <Directory  "/opt/processmaker/workflow/public_html">
    AddDefaultCharset UTF-8
    AllowOverRide none
    Options FollowSymlinks
    Order allow,deny
    Allow from all
    RewriteEngine on
    RewriteRule ^.*/(.*)$ sysGeneric.php [NC,L]
    ExpiresActive On
    ExpiresDefault "access plus 1 day"
    ExpiresByType image/gif "access plus 1 day"
    ExpiresByType image/png "access plus 1 day"
    ExpiresByType image/jpg "access plus 1 day"
    ExpiresByType text/css "access plus 1 day"
    ExpiresByType text/javascript "access plus 1 day"
    AddOutputFilterByType DEFLATE text/html
  </Directory>
</VirtualHost>

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