Value is not a valid member of player?

Greetings,

I've got an error while scripting the server side of my gun shop, this is the server script:

--[[
    By Time_URSS
    Server-sided Gun shop
--]]

--//Variables\\--
local replicatedStorage = game:GetService("ReplicatedStorage")
local remoteFunction = replicatedStorage:WaitForChild("Buy")

--//Functions\\--
remoteFunction.OnServerEvent:Connect(function(player,price,gun)
    player.leaderstats.Rubbles.Value = player.leaderstats.Rubbles.Value - price.Value
    local clonedGun = gun:Clone()
    clonedGun.Parent = player.Backpack
    print("Gun successfully bought, transaction successful.")
end)

This is the client sided script:

--[[
    Script made by: Time_URSS
    Client-sided gun shop
--]]

--//Variables\\--
local player = game.Players.LocalPlayer
local button = script.Parent
local name = button:WaitForChild("FinalName")
local price = button:WaitForChild("FinalPrice")
local nameText = button.Parent.Name
local priceText = button.Parent.Price
local replicatedStorage = game:GetService("ReplicatedStorage")
local remoteFunction = replicatedStorage:WaitForChild("Buy")

--//Functions\\--
local function buyProcess()
    local weapon = replicatedStorage:WaitForChild("Guns"):FindFirstChild(name.Value)
    if weapon then
        if player.leaderstats.Rubbles.Value >= price.Value then
            remoteFunction:FireServer(player,price.Value,weapon)
        else
            warn("Player does not have enough Rubbles to buy the gun. Wait until you've enough.")
        end
    else
        error("Weapon not found, please contact Time_URSS to fix the error. ERROR#050")
    end
end

button.MouseButton1Click:Connect(buyProcess)

And this is the error:

11:59:47.653 - Value is not a valid member of Player
11:59:47.655 - Stack Begin
11:59:47.656 - Script 'ServerScriptService.BuyProcess', Line 12
11:59:47.656 - Stack End

Can somebody help me?