Workspace.PartSpawnTool.Script:8: bad argument #3 to 'CFrame' (CFrame expected, got nil)?

I have a tool.

This is structure:

Screen

This is code of Server Script:

-- Server Script
local Tool = script.Parent
local clickEvent = Tool.Activated
local clickEventConnection

local function createPart(location)
	local part = Instance.new("Part")
	part.CFrame = location
	part.Parent = workspace
end

local function onClick(player, clickLocation)
	wait(0.5)
	createPart(_G.PartSpawnToolLoc)
	print(_G.PartSpawnToolLoc)
end

Tool.Activated:connect(onClick)

This is code of Local Script:

-- Local Script
local Tool = script.Parent
local player = game.Players.LocalPlayer
local mouse = player:GetMouse()

Tool.Equipped:Connect(function(Mouse)
	Mouse.Button1Down:Connect(function()
		_G.PartSpawnToolLoc = mouse.Hit
	end)
end)

When i click with tool it should to be create a part in the mouse location, but there is an error:

Workspace.PartSpawnTool.Script:8: bad argument #3 to 'CFrame' (CFrame expected, got nil)

Why it isn't work?

I am just messing around with Scripting Helpers, I am new haha.

If you have not known this, the value is nil, that's mean you did not reference the variable properly. I think you should try using Remote Events, so you can bring the values over to the two scripts. Plus, it is safer for your game.