How do I fix this so I could have the number displaying?

Hello I had a problem with the text not showing up in the UI. This is my script and I will give you more details

local part = game.Workspace.Generator
local NumBlocks = game.StarterGui.ScreenGui.NumBlocks
local User = NumBlocks.Parent.User
local Rating = NumBlocks.Parent.Rating
local IntValue = Instance.new("IntValue", game.ReplicatedStorage)
wait(3)
while true do
	local LagPart = Instance.new("Part", game.Workspace)
	LagPart.CFrame = LagPart.CFrame * part.CFrame
	--LagPart.Transparency = 1
	IntValue.Value = IntValue.Value + 1
	NumBlocks.Text = (IntValue.Value)
	print(IntValue.Value)
	wait(0.000000000000000000000000000000000000001)
end

So basicly when I run the game I can see how many parts are there. But when I play the script so playing the game the Number of parts don't show up...How do I fix this? This is a script in server script service. Thanks

If you are talking about how many parts you will see in the game then you could use the Clone() function

local part = game.Workspace.Generator
local ScreenGui = player:WaitForChild("PlayerGui"):WaitForChild("ScreenGui")
        local NumBlocks = ScreenGui:WaitForChild("NumBlocks")
        local User = ScreenGui:WaitForChild("User")
        local Rating = ScreenGui:WaitForChild("Rating")

        NumBlocks.Text = tostring(IntValue.Value)
-- and make sure you use playergui since it Will get cloned when the player has loaded
local User = NumBlocks.Parent.User
local Rating = NumBlocks.Parent.Rating
local IntValue = Instance.new("IntValue", workspace) -- intvalues don't run in replicated storage so change it to workspace.
wait(3)
while true do
wait (1)
    local LagPart = Instance.new("Part", game.Workspace)
    LagPart.CFrame = LagPart.CFrame * part.CFrame
    --LagPart.Transparency = 1
    IntValue.Value = IntValue.Value + 1
    NumBlocks.Text = (IntValue.Value)
    print(IntValue.Value)
end
end

Improvements

Use :GetService() for services such as ReplicatedStorage and StarterGui

Set the Parent of a new Instance on a separate line as the run-time is more efficient that way

Use :WaitForChild() to make sure an instance exists before using it

Issues

You are attempting to edit the NumBlocks in the StarterGui, but players have a separate PlayerGui instance where the Guis on their screen are found.

Revised Server Script

local part = game:GetService("Workspace"):WaitForChild("Generator")
local IntValue = Instance.new("IntValue")
IntValue.Parent = game:GetService("ReplicatedStorage")
wait(3)

while true do
	local LagPart = Instance.new("Part")
	LagPart.Parent = game:GetService("Workspace")
	LagPart.CFrame = LagPart.CFrame * part.CFrame
	-- LagPart.Transparency = 1

	IntValue.Value = IntValue.Value + 1
	for index, player in pairs(game:GetService("Players"):GetPlayers()) do
		local ScreenGui = player:WaitForChild("PlayerGui"):WaitForChild("ScreenGui")
		local NumBlocks = ScreenGui:WaitForChild("NumBlocks")
		local User = ScreenGui:WaitForChild("User")
		local Rating = ScreenGui:WaitForChild("Rating")
		
		NumBlocks.Text = tostring(IntValue.Value)
	end
	
	print(IntValue.Value)
	wait()
end