How to setup a simple Apache2 Proxy to Mattermost?

Hi,

I am trying to setup an Apache2 proxy from a subdomain to a port for mattermost.

I have downloaded the mattermost gzip file and extracted all files to /var/www/mattermost. I go to /var/www/mattermost/bin to run the platform script.

Going to http://mattermost.example.com gives me an Error 500 - Internal Server Error and I don't know why. My apache2 config file is below but I just can't figure out what is going wrong. I don't get any error messages in the terminal output. Can anyone help?

<VirtualHost *:80>
    ServerName mattermost.example.com
    ServerAlias mattermost.example.com

    <Proxy *>
        Order allow,deny
        Allow from all
    </Proxy>

    ProxyRequests Off
    ProxyPreserveHost On
    ProxyPass / http://localhost:8065/
    ProxyPassReverse / http://localhost:8065/
</VirtualHost>