My leveling Exp scripts not working. Can someone look at them please?

Ok last time did not work lol. so lets try again...

In the Output I am getting that Config is not a valid member of Model... But that's all i'm getting. And the Player is not getting any exp. So is there something wrong with the two codes? (Leaderstats and NPC exp script) Or am I missing something from my Leaderstats script?

Leaderstats:

game.Players.PlayerAdded:Connect(function(Player) 
    local Leaderstats = Instance.new("Folder", Player) 
    Leaderstats.Name = "Leaderstats" 
    local Level = Instance.new("IntValue", Leaderstats) 
    Level.Name = "LevelLable" 
    Level.Value = 0 
    local Exp = Instance.new("IntValue", Leaderstats) 
    Exp.Name = "ExpLable" 
    Exp.Value = 0 
    if Player.Character and Player.Character:WaitForChild("Humanoid") then
        Player.Character.Humanoid.MaxHealth = 100 + Level.Value*10
    end
    Level.Changed:Connect(function(value)
    if Player.Character and Player.Character:FindFirstChild("Humanoid") then
        Player.Character.Humanoid.MaxHealth = 100 + Level.Value*10
        end
    end)
    Player.CharacterAdded:Connect(function(character)
        character:WaitForChild("Humanoid").MaxHealth = 100 + Level.Value*10
        Player.Character.Humanoid.Health = Player.Character.Humanoid.MaxHealth
    end)
end)

Its the NPC script thats giving the: 20:10:57.577 - Config is not a valid member of Model (Line 1)

local exp = script.Parent.Config.XP.Value


local Humanoid = script.Parent.Humanoid
function PwntX_X() 
local tag = Humanoid:findFirstChild("creator") 
    if tag ~= nil then 
        if tag.Value ~= nil then 
local Leaderstats = tag.Value:FindFirstChild("Leaderstats") 
            if Leaderstats ~= nil then 
Leaderstats.XP.Value = Leaderstats.XP.Value + exp
wait(0.1) 
script:remove()
            end 
        end 
    end 
end 
Humanoid.Died:connect(PwntX_X)