Party fot teleport

[Larb]

I need action movements if player have 4 members in party teleport to pos x if not have 4 members back to pos y
using tfs 1.2 10.99

 

[Infernum]

local destination = Position(1, 2, 3)
local backpos = Position(1, 2, 3)

function onUse(player, item, fromPosition, target, toPosition, isHotkey)
    local party = player:getParty()
    if not party then
        return true
    end
    local members = party:getMembers()
    if #members >= 4 then
        for _, member in ipairs(members) do
            member:teleportTo(destination)
        end
    else
        for _, member in ipairs(members) do
            member:teleportTo(backpos)
        end
    end
    return true
end