this might seem the same as this topic here but the solution to that topic was a typo.
I’ve followed this tutorial to make a global leaderboard, copied everything that’s important and unchangeable. but an error comes saying: Argument 1 missing or nil 
here is my leaderboard script code:
local DataStoreService = game:GetService("DataStoreService")
local KillsLeaderboard = DataStoreService:GetOrderedDataStore("Kills")
local Players = game:GetService("Players")
local Leaderboard = workspace.LeaderboardFolder.Leaderboard
local Frame = Leaderboard.LeaderboardPart.LeaderboardGui.Holder
local LeaderboardFrame = game.ReplicatedStorage:WaitForChild("LeaderboardList")
local function UpdateLeaderboard()
local Success,ErrorMessage = pcall(function()
local Data = KillsLeaderboard:GetSortedAsync(false, 25)
local Page = Data:GetCurrentPage()
for Rank,data in ipairs(Page) do
local Username = Players:GetNameFromUserIdAsync(tonumber(data.key)) -- this part is the error!
local Name = Username
local Kills = data.Value
local IsOnLeaderboard = false
for i,v in pairs(Frame:GetChildren()) do
if v:IsA("Frame") and v.Player.Name == Name then
IsOnLeaderboard = true
break
end
end
if Kills and IsOnLeaderboard == false then
local NewFrame = LeaderboardFrame:Clone()
NewFrame.Parent = Frame
NewFrame.Kills.Text = Kills
NewFrame.Rank = "#"..Rank
end
end
end)
if not Success then
warn(ErrorMessage)
end
end
while true do
for _,player in pairs(Players:GetPlayers()) do
KillsLeaderboard:SetAsync(player.UserId, player.leaderstats.Kills.Value)
end
for _,frame in pairs(Frame:GetChildren()) do
if frame:IsA("Frame") then
frame:Destroy()
end
end
UpdateLeaderboard()
print("Updated!")
wait(10)
end
I’ve temporarily removed the pcall() to check the line, it seems to lead to line 13 tonumber(data.key)
like the other problem above, i will also include the actual leaderstat creation:
local Players = game:GetService("Players")
local DataStoreService = game:GetService("DataStoreService")
local RunService = game:GetService("RunService")
local KillStore = DataStoreService:GetDataStore("Kills")
local DeathsStore = DataStoreService:GetDataStore("Deaths")
Players.PlayerAdded:Connect(function(Player)
local Leaderstats = Instance.new("Folder",Player)
Leaderstats.Name = "leaderstats"
local Kills = Instance.new("IntValue",Leaderstats)
Kills.Name = "Kills"
Kills.Parent = Leaderstats
local Deaths = Instance.new("IntValue",Leaderstats)
Deaths.Name = "Deaths"
Deaths.Parent = Leaderstats
local KillData
local Success,Error = pcall(function()
KillData = KillStore:GetAsync(Player.UserId, Player.leaderstats.Kills.Value)
end)
if Success then
Kills.Value = KillData
print(Player.Name.."'s Kills Successfully Loaded!")
else
warn(Player.Name.."'s Kills Failed Loading!")
warn(Error)
end
local DeathData
local Success,Error = pcall(function()
DeathData = DeathsStore:GetAsync(Player.UserId, Player.leaderstats.Deaths.Value)
end)
if Success then
Deaths.Value = DeathData
print(Player.Name.."'s Deaths Successfully Loaded!")
else
warn(Player.Name.."'s Deaths Failed Loading!")
warn(Error)
end
end)
Players.PlayerRemoving:Connect(function(Player)
local Success,Error = pcall(function()
KillStore:SetAsync(Player.UserId, Player.leaderstats.Kills.Value)
end)
if Success then
print(Player.Name.."'s Kills Saved Successfully!")
else
warn(Player.Name.."'s Kills Failed Saving!")
warn(Error)
end
local Success,Error = pcall(function()
DeathsStore:SetAsync(Player.UserId, Player.leaderstats.Deaths.Value)
end)
if Success then
print(Player.Name.."'s Deaths Saved Successfully!")
else
warn(Player.Name.."'s Deaths Failed Saving!")
warn(Error)
end
end)
game:BindToClose(function()
wait(3) -- emergency shutdown/playtesting!
end)
for now ignore the “Deaths” leaderstat, as this doesnt contribute to the leaderboard (unless it causes a huge problem then mention otherwise!).