blad on inventory click w funkcji

nie dziala mi on inventory click: w funkcji    log: "can't understand this section: on inventory click"

function setBuyAmount(n: number, i: text, p: player) :
    open a new chest inventory with 3 rows named "&7Wybierz ilosc" to {_p}
    set slot 10 of {_p}'s inventory to lime stained glass pane named "&a+1"
    set slot 11 of {_p}'s inventory to lime stained glass pane named "&a+10"
    set slot 12 of {_p}'s inventory to lime stained glass pane named "&a+100"
    set slot 13 of {_p}'s inventory to {_i} named "&7%{_i}%" with lore "&7Wybrana ilosc: &8%{_setAmount::%{_p}%}%" and "&7Cena: %( {_n} * {_setAmount::%{_p}%} )%"

    on inventory click:
        if name of event-inventory is "&7Wybierz ilosc":
            if index of event-slot is 10:
                set slot 13 of {_p}'s inventory to {_i} named "&7%{_i}%" with lore "&7Wybrana ilosc: &8%{_setAmount::%{_p}%}%"
                add 1 to {_setAmount::%{_p}%}
            if index of event-slot is 11:
                set slot 13 of {_p}'s inventory to {_i} named "&7%{_i}%" with lore "&7Wybrana ilosc: &8%{_setAmount::%{_p}%}%"
                add 10 to {_setAmount::%{_p}%}
            if index of event-slot is 12:
                set slot 13 of {_p}'s inventory to {_i} named "&7%{_i}%" with lore "&7Wybrana ilosc: &8%{_setAmount::%{_p}%}%"
                add 100 to {_setAmount::%{_p}%}