Why is my script causing HTTP 401 (unauthorized) Error?

The script:

local GlitchURL = "https://flightwarebot.glitch.me/" --Place the glitch project URL inside of the quotes
local ReplicatedStorage = game:GetService("ReplicatedStorage")
local Remotes = ReplicatedStorage:WaitForChild("Remotes")
local HttpService = game:GetService("HttpService")
--Getting player's UserId
local UserId
game.Players.PlayerAdded:Connect(function(player)
	UserId = player.UserId
end)
--Making sure we don't get nil value.
repeat
	print("UserId not found")
	wait()
until UserId ~= nil
local RoleId
local function rankUser(UserId, RoleId)
	HttpService:GetAsync(GlitchURL.. "ranker?userid="..UserId.."&rank="..RoleId) --Error occurs at line 17.
end



Remotes.Fighter.OnServerEvent:Connect(function(player)
	RoleId = 5
	rankUser(UserId, RoleId)
	player:Kick("You have been ranked.")
end)
Remotes.Airline.OnServerEvent:Connect(function(player)
	RoleId = 2
	rankUser(UserId, RoleId)
	player:Kick("You have been ranked.")
end)
Remotes.Stunt.OnServerEvent:Connect(function(player)
	RoleId = 4
	rankUser(UserId, RoleId)
	player:Kick("You have been ranked.")
end)
Remotes.Ground.OnServerEvent:Connect(function(player)
	RoleId = 6
	rankUser(UserId, RoleId)
	player:Kick("You have been ranked.")
end)
Remotes.Cargo.OnServerEvent:Connect(function(player)
	RoleId = 3
	rankUser(UserId, RoleId)
	player:Kick("You have been ranked.")
end)

I have no idea why this happens. Please help. All and any is appreciated.

wrap the function side a pcall sinse youre making a request outside roblox so like

pcall(function()
	HttpService:GetAsync
end)

also, go into game settings and make sure the game has http and api access enabled