Can't detect what the part's name is, in the raycast?

My Raycast won't detect what the part's Name is ? - If that makes sense.

local basePlate = game.Workspace.basePlate

local rayOrigin = game.Workspace.Part.Position

local rayDirection = Vector3.new(0,30,0)


local raycastParams = RaycastParams.new()

raycastParams.FilterDescendantsInstances = {basePlate}
raycastParams.FilterType = Enum.RaycastFilterType.Blacklist

local raycastResults = workspace:Raycast(rayOrigin, rayDirection, raycastParams)



while wait(0.1) do
	local hit = raycastResults.Instance

	print(hit.Name)	

end

The error code that i'm getting : attempt to index nil with 'Instance'