why do i get "Unable to cast value to Objects" error when running this code? [Solved]

local Part = Instance.new("Part")

Part.Position = Vector3.new(0,20,0)
Part.Parent = workspace

Part.Touched:Connect(function()
	local RedPart = Instance.new("Part")
	RedPart.Position = Part.Position
	Part:Destroy()
	RedPart.Transparency = 1
	RedPart.Size = workspace.Part.Size
	RedPart.Anchored = true
	
	RedPart.Parent = workspace
	RedPart:SubtractAsync(workspace.Baseplate)
end)

im trying to make a part that falls down the air and when it touches the baseplate it removes part of the baseplate

You destroyed part before you accessed it's size. Change your code to this:

local Part = Instance.new("Part")

Part.Position = Vector3.new(0,20,0)
Part.Parent = workspace

Part.Touched:Connect(function()
    local RedPart = Instance.new("Part")
    RedPart.Position = Part.Position
    RedPart.Transparency = 1
    RedPart.Size = workspace.Part.Size
    Part:Destroy()
    RedPart.Anchored = true

    RedPart.Parent = workspace
    RedPart:SubtractAsync(workspace.Baseplate)
end)

That should work

i fixed my problem it was because on line 15 it was

RedPart:SubtractAsync(workspace.Baseplate)

instead of

RedPart:SubtractAsync({workspace.Baseplate})

tho your code didnt fix my issue but thanks anyways