Why won't my Loading GUI duplicate? [closed]

Hello, I am trying to replace ROBLOX's loading screen with my loading screen. I am using a script I modified from the wiki to help me do this. The LocalScript is in the ReplicatedFirst service and the GUI is in the ReplicatedStorage service.

My problem is that my script will not transfer my loading screen to the player. I've used printing to see where the script stops, but it doesn't even print anything, nor do I get any errors in the output. What do I do?

LocalScript:

script.Parent:RemoveDefaultLoadingScreen()
print("Removed default load screen") --Doesn't even pass this.

local screen = game:GetService("ReplicatedStorage").PreloadGui:Clone()
print("Cloned GUI")
screen.Parent = game.Players.LocalPlayer:WaitForChild("PlayerGui")

local textLabel = screen.Back.Loading
print("Found text")

local count = 0

print("Starting while loop")
while game.ContentProvider.RequestQueueSize > 0 do
    textLabel.Text = "Loading "
    for i=1,count do
        textLabel.Text = textLabel.Text .. "."
    end 
    count = (count + 1) % 4
    wait(.3) 
end

print("While loop done, for loop begin") 
for i = 0,1,0.1 do
    screen.Back.ImageLabel.ImageTransparency = i
    screen.Back.Loading.TextTransparency = i
    wait(0.1)
end
print("Complete, setting values.")
game.Players.LocalPlayer:WaitForChild("LoadedGame").Value = true
screen.Parent = nil

Any help is appreciated, thanks!