Wazne pytanie dotyczace GUI

Witam. mam taki skrypt

command /sklep [<text>]:
    trigger:
        open chest with 1 rows named "&6Sklep" to player
        set player's current inventory's slot 0 to green wool named "&aKupno itemow"
        set player's current inventory's slot 1 to red wool named "&cSprzedawanie itemow"
        
on inventory click:
    if inventory name of current inventory of player is "&6Sklep":
        if player's current inventory's slot slot is green wool:
            cancel event
            send "&6Wkrotce..."
        if player's current inventory's slot slot is red wool:
            cancel event
            send "&6Wkrotce..."

NIe dziala mi linijka "if inventory name of current inventory of player is "&6Sklep":".

wywala taki blad:

'player' is not an item stack (test.sk, line 8: if inventory name of current invenotry of player is "&6Sklep":)