Getting Uncaught ReferenceError: config is not defined

I am getting a blank grey screen page with this Uncaught ReferenceError: config is not defined.
I wanted to implement jwt tokens
this is the link which I followed to setup: https://github.com/mjtiempo/Docs/blob/master/Jitsi%20Meet%20Installation.md
Thanks in advance.

You either have a syntax error in the file or ssi is not turned on the webserver.