Help using jitsi with php

hello im trying to use jitsi with my php website, but when I’m using the available code to add jitsi to my website, the generated link to participate to the meeting is not working, I get an error with this link :

The message : The requested URL was not found on this server.

i will like to know why ?
it writing that I don’t have nothing else to do except add the code to my website and start to use jitsi, maybe I have something else to do ?
May someone can helps me…