Error making a loop

[LegotronForce]

I have the code

on load:
    set {custom.items::copper} to glowstone dust named "&eCopper" with lore "&7&lRarity:&r &7Common" and "&8&oUsed for copper wire, it is in almost all machines."
    set {custom.items::steelingot} to netherite ingot named "&eSteel" with lore "&7&lRarity:&r &aUncommon" and "&8&oThe steel ingot is versatile."
    set {custom.items::steel_casing} to netherite block named "&eSteel Casing" with lore "&7&lRarity:&r &bRare" and "&8&oThe casing to put all your machine parts."

command /allitem:
    trigger:
        for {custom.items::*}:
            give player loop-value

and it give the error

can't understand this condition: 'for {custom.items::*}' (customitems.sk, line 11: for {custom.items::*}:')

Does anyone know why this is happening?

 

[Nikd0]

https://en.njol.ch/projects/skript/doc/loops
always read the documentation before asking

 

[couger44]

I have the code

on load:
    set {custom.items::copper} to glowstone dust named "&eCopper" with lore "&7&lRarity:&r &7Common" and "&8&oUsed for copper wire, it is in almost all machines."
    set {custom.items::steelingot} to netherite ingot named "&eSteel" with lore "&7&lRarity:&r &aUncommon" and "&8&oThe steel ingot is versatile."
    set {custom.items::steel_casing} to netherite block named "&eSteel Casing" with lore "&7&lRarity:&r &bRare" and "&8&oThe casing to put all your machine parts."

command /allitem:
    trigger:
        for {custom.items::*}:
            give player loop-value

and it give the error

can't understand this condition: 'for {custom.items::*}' (customitems.sk, line 11: for {custom.items::*}:')

Does anyone know why this is happening?

The correct syntax is like this:

command /allitem:
    trigger:
        loop {custom.items::*}:
            give loop-value to player