What does this mean?

[Ray Jender]

I am trying to figure out how to run php/mysql on the antmedia server and stumbled onto this:

root@RaysServer:/usr/local/antmedia/webapps/WebRTCApp/WEB-INF/cgi/amd64-linux# cat php-cgi.MISSING.README.txt
You can add "php-cgi" to this directory and re-deploy your web application.

What exactly does this mean?

Thanks,

Ray