Datastore2 Not Saving Mob Drops?

I'm working on an rpg mob's drop system. I've opted for Datastore2. The data (xp, gold, levels) doesn't seem to be saving though. I always get this error on levelDataStore:Increment(Config.AwardedLvl): ServerScriptService.MainModule:253: attempt to perform arithmetic (add) on function and number.

Here's the stat award script:

if hit.Parent.Parent then --Defined via touched event
                                local Player = hit.Parent.Parent
                                if game.Players:GetPlayerFromCharacter(Player) then
                                    local PlayerObj = game.Players:GetPlayerFromCharacter(Player)
                                    print(PlayerObj)

                                    local goldDataStore = Datastore2("gold", PlayerObj)
                                    local expDataStore = Datastore2("exp", PlayerObj)
                                    local levelDataStore = Datastore2("level", PlayerObj)
                                    if Player:FindFirstChild("Humanoid") then

                                        local Human = Player:FindFirstChild("Humanoid")
                                        if Config.RestoreHealth == true then
                                            Human.Health = Human.MaxHealth
                                        end
                                        goldDataStore:Increment(Config.AwardedGold)
                                        expDataStore:Increment(Config.AwardedXP)
                                        levelDataStore:Increment(Config.AwardedLvl)
                                        print("Stats Awarded")

Here's the Datastore Handler:

-- Datastore2 Declarations
local Datastore2 = require(SSS.MainModule) --SSS is refers to ServerScriptService and Main Module is of Datastore2

local defaultGold = GameConfig.DefaultGold
local defaultExp = GameConfig.DefaultExp
local defaultLevel = GameConfig.DefaultLevel

Datastore2.Combine("Data", "gold", "exp", "level")

-- Create leaderstats
game.Players.PlayerAdded:Connect(function(plr)
    local goldDataStore = Datastore2("gold", plr)
    local expDataStore = Datastore2("exp", plr)
    local levelDataStore = Datastore2("level", plr)

    local leaderstats = Instance.new("Folder")
    leaderstats.Name = "leaderstats"
    leaderstats.Parent = plr


    local Gold = Instance.new("IntValue", leaderstats)
    Gold.Name = "Gold"
    local Exp = Instance.new("IntValue", leaderstats)
    Exp.Name = "Exp"
    local Level = Instance.new("IntValue", leaderstats)
    Level.Name = "Level"

-- Value update system

    local function goldUpdate(updatedValue)
        Gold.Value = goldDataStore:Get(updatedValue)
    end
    local function expUpdate(updatedValue)
        Exp.Value = expDataStore:Get(updatedValue)
    end
    local function levelUpdate(updatedValue)
        Level.Value = levelDataStore:Get(updatedValue)
    end

    goldUpdate(defaultGold)
    goldDataStore:OnUpdate(goldUpdate)
    expUpdate(defaultExp)
    expDataStore:OnUpdate(expUpdate)
    levelUpdate(levelUpdate)
    levelDataStore:OnUpdate(levelUpdate)
end)

What seems to be the issue?