Lua | Помогите исправить ошибку

 local plr = game.Players.LocalPlayer 
local plrmdl = game.Workspace:WaitForChild(plr.Name) 
 
 
local function createTracer(startPosition, endPosition)  
 
    local directionVector = (endPosition - startPosition) 
    local distance = directionVector.Magnitude 
 
    
 
    -- Создаем трейсер 
	 
	wait(0.2) 
    local tracer = Instance.new("Part")  
    tracer.Color = CTRCLR 
    tracer.Size = Vector3.new(0.2, 0.2, distance)  
    tracer.Anchored = true  
    tracer.CanCollide = false  
    tracer.Material = Enum.Material.Neon  
   
 
    tracer.CFrame = CFrame.lookAt( 
        startPosition + directionVector/2, -- Центр трейсера 
        endPosition                        -- Направление взгляда 
    ) 
 
 
    tracer.Parent = Workspace  
    wait(1) 
    tracer.Transparency = 0.1 
    wait(0.001) 
    tracer.Transparency = 0.2 
    wait(0.001) 
    tracer.Transparency = 0.3 
    wait(0.001) 
    tracer.Transparency = 0.4 
    wait(0.001) 
    tracer.Transparency = 0.5 
    wait(0.001) 
    tracer.Transparency = 0.6 
    wait(0.001) 
    tracer.Transparency = 0.7 
    wait(0.001) 
    tracer.Transparency = 0.8 
    wait(0.001) 
    tracer.Transparency = 0.9 
    wait(0.001) 
    tracer.Transparency = 1 
 
    game:GetService("Debris"):AddItem(tracer) 
end  
 
 
plrmdl.ChildAdded:Connect(function(child) 
    if child.ClassName == "Tool" then 
        print("Debug Message > Tool name: ".. child.Name) 
        local gun = child 
 
        gun.Activated:Connect(function() 
            createTracer(rootPart.Position, mouse.Hit.Position) 
        end) 
 
        else 
        print("Debug Message > NOT A TOOL, Model name:".. child.Name) 
    end 
end)