Not showing

Greetings!
I installed but its not working. I used the <?php if(function_exists(‘spr_show_rating’)){echo spr_show_rating();}?> for that page
Still nothing shows.

Help?

https://www.dgcp.gob.do/index.php/servicios/registro-de-proveedores/

The page I need help with: [log in to see the link]