problem with DataStore '403: Cannot write to DataStore from studio if API access is not enabled'?

i don't know what i did wrong to get this output '403: Cannot write to DataStore from studio if API access is not enabled.'

**If you need any more information about the script just comment thanks already **

the full output is: ' 14:21:54.090 - 403: Cannot write to DataStore from studio if API access is not enabled. 14:21:54.090 - Stack Begin 14:21:54.091 - Script 'ServerScriptService.Stats', Line 18 - global savedata 14:21:54.091 - Script 'ServerScriptService.Stats', Line 91 14:21:54.092 - Stack End '

line 17-18-19:

function savedata(dataname, playerid, value)
    game:GetService("DataStoreService"):GetDataStore(dataname):SetAsync(playerid, value --line 18
end

line 90 - 95

game.Players.PlayerRemoving:connect(function(player)
    savedata("Levels", player.userId, player:WaitForChild('Stats').Level.Value) -- line 91
    savedata("XP", player.userId, player:WaitForChild('Stats').XP.Value)
    savedata("AXP", player.userId, player:WaitForChild('Stats').XpNeeded.Value)
    savedata("Cor", player.userId, player:WaitForChild('Stats').Cor.Value)
end)

FULL SCRIPT:

local level = game:GetService("DataStoreService"):GetDataStore("Levels")
local xp = game:GetService("DataStoreService"):GetDataStore("XP")
local axp  = game:GetService("DataStoreService"):GetDataStore("AXP") -- amount needed

local cor = game:GetService("DataStoreService"):GetDataStore("Cor") -- money

local OHS  = game:GetService("DataStoreService"):GetDataStore("OneHandedSword")
local R  = game:GetService("DataStoreService"):GetDataStore("Rapier")
local THS  = game:GetService("DataStoreService"):GetDataStore("TwoHandedSword")

local Agility = game:GetService("DataStoreService"):GetDataStore("Agility")
local Stamina = game:GetService("DataStoreService"):GetDataStore("Stamina")
local Strength = game:GetService("DataStoreService"):GetDataStore("Strength")

---------------------------------------------------------------------------------

function savedata(dataname, playerid, value)
    game:GetService("DataStoreService"):GetDataStore(dataname):SetAsync(playerid, value)
end

game.Players.PlayerAdded:connect(function(player)
    local leader = Instance.new('Folder')
    leader.Name = "leaderstats"
    leader.Parent = player

    local Stats = Instance.new('Folder')
    Stats.Name = 'Stats'
    Stats.Parent = player

    local LevelUp = Instance.new("IntValue")
    LevelUp.Value = level:GetAsync(tostring(player.userId)) or 1
    LevelUp.Name = "Level"
    LevelUp.Parent = player:WaitForChild('Stats')

    local XpUp = Instance.new("NumberValue")
    XpUp.Value = xp:GetAsync(tostring(player.userId))
    XpUp.Name = "XP"
    XpUp.Parent = player:WaitForChild('Stats')


    local xpn = Instance.new("IntValue")
    xpn.Value = axp:GetAsync(tostring(player.userId)) or 200
    xpn.Name = "XpNeeded"
    xpn.Parent = player:WaitForChild('Stats')

    local Cor = Instance.new("NumberValue")
    Cor.Value = cor:GetAsync(tostring(player.userId)) or 0
    Cor.Name = "Cor"
    Cor.Parent = player:WaitForChild('Stats')

    local OneHandedSword = Instance.new("NumberValue")
    OneHandedSword.Value = OHS:GetAsync(tostring(player.userId)) or 1
    OneHandedSword.Name = "OneHandedSword"
    OneHandedSword.Parent = player:WaitForChild('Stats')

    local TwoHandedSword = Instance.new("NumberValue")
    TwoHandedSword.Value = THS:GetAsync(tostring(player.userId)) or 1
    TwoHandedSword.Name = "TwoHandedSword"
    TwoHandedSword.Parent = player:WaitForChild('Stats')

    local rap = Instance.new("NumberValue")
    rap.Value = R:GetAsync(tostring(player.userId)) or 1
    rap.Name = "Rapier"
    rap.Parent = player:WaitForChild('Stats')

    XpUp.Changed:connect(function()
        if player:WaitForChild("XP").Value >= player:WaitForChild("XpNeeded").Value then
            LevelUp.Value = LevelUp.Value+1
            LevelUp.Changed:connect(function()
                XpUp.Value = 0
            end)
            savedata("Levels", player.userId, LevelUp.Value)
            savedata("XP", player.userId, XpUp.Value)
            savedata("AXP", player.userId, xpn.Value)
            else
            savedata("Levels", player.userId, LevelUp.Value)
            savedata("XP", player.userId, XpUp.Value)
            savedata("AXP", player.userId, xpn.Value)
            end
        savedata("Levels", player.userId, LevelUp.Value)
        savedata("XP", player.userId, XpUp.Value)
        savedata("AXP", player.userId, xpn.Value)
    end)
    Cor.Changed:connect(function()
        savedata("Cor", player.userId, Cor.Value)
    end)
    savedata("Cor", player.userId, Cor.Value)
end)

game.Players.PlayerRemoving:connect(function(player)
    savedata("Levels", player.userId, player:WaitForChild('Stats').Level.Value)
    savedata("XP", player.userId, player:WaitForChild('Stats').XP.Value)
    savedata("AXP", player.userId, player:WaitForChild('Stats').XpNeeded.Value)
    savedata("Cor", player.userId, player:WaitForChild('Stats').Cor.Value)
end)