placeholders repost cause im to dumb to understand the solution

[VoidOfCatastrophe]

Skript Version: 2.5.3
Skript Author: Bensku
Minecraft Version: 1.16.4
---
Full Code:

Code (Skript):

set {_prefix} to placeholder "player_level" # placeholder "%%player_level%%" is also valid

command /skills:
trigger:
set {_gui} to a new chest inventory with 6 row with name "&c&lSkills"
set slot 13 of {_gui} to red stained glass pane named "&7&l%%player%%" with lore "%{_prefix}%"
open {_gui} to player

on inventory click:
if name of event-inventory is "&c&lSkills":
if index of event-slot = 13:
cancel event
send "%{_prefix}%"

Errors on Reload:

Code (Skript):

invalid line - all code has to be put into triggers (skills.sk, line 1: set {_prefix} to placeholder "player_level"# placerholder "%%player_level%%" is also valid')

Console Errors: (if applicable)

Code (Skript):

1. got no console error

Other Useful Info:

Addons using (including versions):
ersatz

Troubleshooting:

Have you tried searching the docs? Yes
Have you tried searching the forums? No
What other methods have you tried to fix it? I have tried to google it but nothing showed anything helpful
[doublepost=1613785166,1613555018][/doublepost]It would help if someone could just send me a working version of the skript since i might not understand the solution
[doublepost=1613789785][/doublepost]im no longer dumb