Head is not a valid member of Workspace? [really not that simple]

Yep, title. That is the error, I really don't get it. The script worked before I added the "lucky block" portion. (All but the Lucky Block portion works, it is sectioned out.)

Thanks for all the help.

function onButton1Down(mouse)
print(game.Workspace[script.Parent.Parent.Parent.Name])
posp = game.Workspace[script.Parent.Parent.Parent.Name].Head.Position
local ray = Ray.new(game.Workspace[script.Parent.Parent.Parent.Name].Head.Position, mouse.Hit.p)
local hit, position = game.Workspace:FindPartOnRay(ray, game.Workspace[script.Parent.Parent.Parent.Name])

--do damage to any humanoids hit
local humanoid = hit and hit.Parent and hit.Parent:FindFirstChild("Humanoid")

--draw the ray
local distance = (position - posp).magnitude
local rayPart = Instance.new("Part", game.Workspace)
rayPart.Name = "RayPart"
rayPart.BrickColor = BrickColor.new("Bright red")
rayPart.Transparency = 0.5
rayPart.Anchored = true
rayPart.CanCollide = false
rayPart.TopSurface = Enum.SurfaceType.Smooth
rayPart.BottomSurface = Enum.SurfaceType.Smooth
rayPart.formFactor = Enum.FormFactor.Custom
rayPart.Size = Vector3.new(0.2, 0.2, distance)
rayPart.CFrame = CFrame.new(position, posp) * CFrame.new(0, 0, -distance/2)
game.Debris:AddItem(rayPart, 0.1)
if hit == nil then 
elseif game.Workspace[hit.Name].type ~= nil and hit.Name:gsub(hit.Name:sub(1,4),"") == "Turbo" then
print("plane hit")
game.Workspace.explode:play()
-- game.Workspace[hit.Name].Position = Vector3.new(-68, 12, -43.5)
game.Workspace[hit.Name]:remove()
-- print(game.Workspace[hit.Name].Position)
local h = Instance.new("Hint", game.Players[script.Parent.Parent.Parent.Name].PlayerGui) 
text = " "..hit.Name:gsub(hit.Name:sub(1,4), "").." destroyed."
for i = 1, #text do
h.Text = text:sub(i)
wait(.1)
end
h:remove()


-- NEW AREA THAT ERRORS BELOW

elseif game.Workspace[hit.Name].placer then
local h = Instance.new("Hint", game.Players[script.Parent.Parent.Parent.Name].PlayerGui) 
text = " Lucky Block Opened."
for i = 1, #text do
h.Text = text:sub(i)
wait(.1)
end
h:remove()
end


end

-- END FAIL AREA

function onSelected(mouse)
mouse.Button1Down:connect(function() onButton1Down(mouse) end) 
end

script.Parent.Selected:connect(onSelected)

First of all, you need to tab your code.

Using script.Parent.Parent.Parent.Name repeatedly the way you are is not advisable.

If this is a LocalScript, you can refer directly to the current player by game.Players.LocalPlayer. Otherwise, let's simplify your references with just a few sweet lines:

player = game.Players[ script.Parent.Parent.Parent.Name ]
repeat
	character = player.Character
	wait()
until character

You should definitely not be doing Worksapace[hit.Name]. Just use hit.

Doing things like

elseif hi.placer then -- also a typo...

Dont' work. If placer isn't a child of hi, then you just error.

Use :FindFirstChild.

I'm not sure what you mean by hit.Name:gsub(hit.Name:sub(1,4),"") If you want from position five onward, just use hit.Name:sub(5).

You should really work slower and think more carefully, and probably review the simpler stuff.