un able to cast value to objects ray casting, issue?

not sure whats going on here wached a video, and did everything he did but seems, to not work I had it working, the first time but when I went to save studio crashed and didn't save,

local ray = Ray.new(script.Parent.Position,Vector3.new(0,100,0))

while wait(1) do
    local hit,position = workspace:FindPartOnRayWithIgnoreList(ray,(script.Parent))
    if hit then
        print(hit.Name)
        local p = Instance.new("Part",workspace)
        p.Anchored = true
        p.CFrame = CFrame.new(position)
        p.Size = Vector3.new(1,1,1)
        game:GetService("Debris"):AddItem(p,1)
    end
end