How do i fix no property name for object error?

local rp = game:GetService("ReplicatedStorage")
local summon = rp:WaitForChild("Summon")

local tweenservice = game:service("TweenService")

summon.OnServerEvent:connect(function(player,isactive)
    local character = player.character
    local humanoid = character.Humanoid
    local Humrp = character.HumanoidRootPart

    if isactive then
        local Humrp = character.HumanoidRootPart
        local stand = script:WaitForChild("Stand"):Clone()

        for _, part in pairs(stand:GetChildren()) do
            if part:IsA ("BasePart") then
                part.Transparency = 1
            end 
        end

        stand.Parent = character

        local weld = Instance.new("ManualWeld")
        weld.Part0 = stand.PrimaryPart
        weld.Part1 = Humrp
        weld.C0 = weld.Part0.CFrame.ToObjectSpace(weld.Part1.CFrame)
        weld.Parent = weld.Part0

        local AnimControl = stand:FindFirstChild("AnimControl")
        local standhumrp = stand:FindFirstChild("HumanoidRootPart")

        local Idle = AnimControl:LoadAnimation(script.Idle)
        Idle:play()

        for _, part in pairs(stand:GetChildren()) do
            if part:IsA ("BasePart") and part ~= standhumrp then
                local goal = {}
                goal.transparency = 0
                local info = TweenInfo.new(.5)
                local tween = tweenservice:create(part,info,goal)
                tween:play()

            end 
        end

        local goal = {}
        goal.C0=weld.Part0.CFrame:ToObjectSpace(weld.Part1.CFrame)
        goal.C1 = weld.Part0.CFrame:ToObjectSpace(weld.Part1.CFrame * CFrame.new(-3,1,2))
        local info = TweenInfo.new(.5)
        local tween = tweenservice:create(weld,info,goal)
        tween:play()

    else


    end
end)

ERROR: TweenService:Create no property named 'transparency' for object 'LeftHand' 

Line: Line 40