help with welding

[river rivet]

local UIS = game:GetService("UserInputService")
local players = game:GetService("Players")
local workspace = game.Workspace
local ball = workspace.Ball
local prox = workspace.Proxpart.Pickup

game.Players.PlayerAdded:Connect(function(plr)
    plr.CharacterAdded:Connect(function(char)
        local hum = char:WaitForChild("Humanoid")
        local rightarm = char:WaitForChild("Right Arm")
        prox.Triggered:Connect(function(player)
            if player == plr then
                local cloneball = ball:Clone()
                cloneball.Parent = rightarm

                local WeldConstraint = Instance.new("WeldConstraint")
                WeldConstraint.Part0 = cloneball
                WeldConstraint.Part1 = rightarm
                WeldConstraint.Parent = cloneball
                
                cloneball.CFrame = rightarm.CFrame
            end
        end)
    end)
end)

[river rivet]

@onyx oar

[onyx oar]

oh yeah

you fixed it?

[river rivet]

i think so

[onyx oar]

oh i thought you just set it like lua

well thank you

[river rivet]

np

[onyx oar]

[onyx oar]

it didnt work btw

same error