Player empty inventory slot

[dxcf]

So i was having a problem trying to fill player's inventory with soup:

command /fillpots <player>:
    executable by: console
    trigger:
        wait 1 seconds
        if player has enough space for 1 iron chestplate:
            set {_need} to 1
        if player has enough space for 2 iron chestplate:
            set {_need} to 2
        if player has enough space for 3 iron chestplate:
            set {_need} to 3
        if player has enough space for 4 iron chestplate:
            set {_need} to 4
        if player has enough space for 5 iron chestplate:
            set {_need} to 5
        if player has enough space for 6 iron chestplate:
            set {_need} to 6
        if player has enough space for 7 iron chestplate:
            set {_need} to 7
        if player has enough space for 8 iron chestplate:
            set {_need} to 8
        if player has enough space for 9 iron chestplate:
            set {_need} to 9
        if player has enough space for 10 iron chestplate:
            set {_need} to 10
        if player has enough space for 11 iron chestplate:
            set {_need} to 11
        if player has enough space for 12 iron chestplate:
            set {_need} to 12
        if player has enough space for 13 iron chestplate:
            set {_need} to 13
        if player has enough space for 14 iron chestplate:
            set {_need} to 14
        if player has enough space for 15 iron chestplate:
            set {_need} to 15
        if player has enough space for 16 iron chestplate:
            set {_need} to 16
        if player has enough space for 17 iron chestplate:
            set {_need} to 17
        if player has enough space for 18 iron chestplate:
            set {_need} to 18
        if player has enough space for 19 iron chestplate:
            set {_need} to 19
        if player has enough space for 20 iron chestplate:
            set {_need} to 20
        if player has enough space for 21 iron chestplate:
            set {_need} to 21
        if player has enough space for 22 iron chestplate:
            set {_need} to 22
        if player has enough space for 23 iron chestplate:
            set {_need} to 23
        if player has enough space for 24 iron chestplate:
            set {_need} to 24
        if player has enough space for 25 iron chestplate:
            set {_need} to 25
        if player has enough space for 26 iron chestplate:
            set {_need} to 26
        if player has enough space for 27 iron chestplate:
            set {_need} to 27
        if player has enough space for 28 iron chestplate:
            set {_need} to 28
        if player has enough space for 29 iron chestplate:
            set {_need} to 29
        if player has enough space for 30 iron chestplate:
            set {_need} to 30
        wait 1 tick
        if {potprefer::%arg-1's uuid%} is true:
            make console execute command "minecraft:give %arg-1% minecraft:splash_potion{Potion:""minecraft:water"",CustomPotionEffects:[{Id:6,Amplifier:1}],display:{Name:""\""\\u00A7eHealth Potion\""""}} %{_need}%"
        else:
            make console execute command "minecraft:give %arg-1% minecraft:mushroom_stew{display:{Name:""{\""text\"":\""\\u00A7eSoup\""}""}} %{_need}%"

In console:

[13:12:35] [Server thread/INFO]: Expected integer
[13:12:35] [Server thread/INFO]: ...tion\""}} <none><--[HERE]