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?