Weld problem., pls help me to fix it

hi , i want to fix this weld problem pls help me

robloxapp-20210502-1006109.wmv (1.0 MB)
heres the code

	local Weld = Instance.new("Weld")
		Weld.Part0 = humanoidRP
		Weld.Part1 = Stand_HumanoidRP
		Weld.C0 = Stand_HumanoidRP.CFrame:inverse() * humanoidRP.CFrame
			Weld.Parent = Weld.Part0
			local goal = {}
			goal.C0 = CFrame.new(1,0.4,2)
				local Tweenin =TweenInfo.new(.2,Enum.EasingStyle.Linear)
				Transparency(false,Obj.Value)
	local Tween_ArePlaying = 		Tween:Create(Weld,Tweenin,goal):Play()