Am making a placement system but cant get it to work just gives me error?

So, that you saw in the title i am making a placement system and i just gives me this error.

01:06:08.662 - Players.ObStactionD3stroy3r.PlayerScripts.LocalScript:23: attempt to index field 'PrimaryPart' (a nil value)
01:06:08.662 - Stack Begin
01:06:08.662 - Script 'Players.ObStactionD3stroy3r.PlayerScripts.LocalScript', Line 23 - local MakeCopy
01:06:08.662 - Script 'Players.ObStactionD3stroy3r.PlayerScripts.LocalScript', Line 50

Heres the script.

local player = game:GetService("Players").LocalPlayer
local mouse = player:GetMouse()
local uis = game:GetService("UserInputService")

local rep = game:GetService("ReplicatedStorage")
local materials = rep:WaitForChild("Materials")

local currentBlock = "WoodenBlock"
local currentcopy

local currentPiece = Instance.new("Folder")
currentPiece.Name = "currentPiece"

local function idk(num)
	return math.floor(num+0.5)
end

local function MakeCopy()
	local find = materials:FindFirstChild(currentBlock)
	
	if (find) then
		local c = find:clone()
		c.PrimaryPart.Transparancy = 0.5
		c.PrimaryPart.CanCollide = false
		c.Parent = game.Workspace
		currentcopy = c
	end
end

local function Move()
	local t, b = game.Workspace.CurrentCamera:WorldToViewportPoint(mouse.Hit.p)
	local find = materials:FindFirstChild(currentBlock)
	local tar = game.Workspace:FindPartOnRay(Ray.new(game.Workspace.CurrentCamera.CFrame.p, (mouse.Hit.p - game.Workspace.CurrentCamera.CFrame.p).unit * 500), currentcopy)
	
	if (b and find and currentcopy) then
		local tar = game.Workspace:FindPartOnRay(Ray.new(game.Workspace.CurrentCamera.CFrame.p, (mouse.Hit.p - game.Workspace.CurrentCamera.CFrame.p).unit * 500), currentcopy)
		currentcopy:SetPrimaryPartCFrame(CFrame.new(idk(mouse.Hit.p.X), mouse.Hit.p.Y+2, idk(mouse.Hit.p.Z)))
	end
end

local function Click()
	local t, b = game.Workspace.CurrentCamera:WorldToViewportPoint(mouse.Hit.p)
	local find = materials:FindFirstChild(currentBlock)
	
	if (b and find) then
		local c = find:clone()
		c.Parent = game.Workspace
		c:SetPrimaryPartCFrame(CFrame.new(idk(mouse.Hit.p.X), mouse.Hit.p.Y+2, idk(mouse.Hit.p.Z)))
	end
end

MakeCopy()

uis.InputBegan:connect(function(input)
	if (input.UserInputType == Enum.UserInputType.MouseButton1) then
		Click()
	end
end)

uis.InputBegan:connect(function(input)
	if (input.UserInputType == Enum.UserInputType.MouseButton1) then
		Move()
	end
end)