Placeholders with skript

[MaxiMenace]

Hello (sorry for my english by advance), i'm making a skript that works similary to advanced mob arena.
I have installed the latest version of skript-placeholders (1.6.0)
Here, i want to create a placeholder for "wave" :

on placeholderapi placeholder request for the prefix "ctp":
        if the identifier is "wave":
            set the result to "%{wave}%"

When i reload the script, i get the error "Can't understand this section : on placeholderapi placeholder request for the prefix "ctp".

Is my code bad or maybe it's because skript-placeholders don't work ? Here are some specifications :
Server version : Paper 1.20.6 148
Skript version : 2.9.0

 

[Luke_Sky_Walker]

Hello (sorry for my english by advance), i'm making a skript that works similary to advanced mob arena.
I have installed the latest version of skript-placeholders (1.6.0)
Here, i want to create a placeholder for "wave" :

on placeholderapi placeholder request for the prefix "ctp":
        if the identifier is "wave":
            set the result to "%{wave}%"

When i reload the script, i get the error "Can't understand this section : on placeholderapi placeholder request for the prefix "ctp".

Is my code bad or maybe it's because skript-placeholders don't work ? Here are some specifications :
Server version : Paper 1.20.6 148
Skript version : 2.9.0

You're looking for the expression:

on papi request for prefix "example":