Format Slot

[RichardContent]

So I want to make a Format gui with on and off but there is always this error message "end crystal named "&a&lTest" is not an nbt compound" Can somebody fix that?

function uGUI(p: player):
    set {_p}'s metadata tag "uGUI" to chest inventory with 5 rows named "TEST"
    set slot 30 of {_p}'s metadata tag "uGUI" to End Crystal named "&a&lTest" with lore "&fClick to change <##ff0000>OFF"
    open {_p}'s metadata tag "uGUI" to {_p}

command /test:
    trigger:
        uGUI(player)
on inventory click:
    if event-inventory = player's metadata tag "uGUI":
        cancel event
        if index of event-slot = 30:
            format slot 30 of player with End Crystal named "&a&lTest" with lore "&fClick to change &aON"

 

[Max54nj]

try:

set slot 30 of player's current inventory to end crystal named "&a&lTest" with lore "&fClick to change &aON"