Unable to cast token int?

local Tool = script.Parent
local UserInputService = game:GetService("UserInputService")
local ContextActionService= game:GetService("ContextActionService")
local Cam = workspace.CurrentCamera
local function MoveForward()
    Cam.CFrame = Cam.CFrame*CFrame.new(5,0,0)

end
Tool.Equipped:Connect(function()
    while true do
        wait()
        if UserInputService:IsMouseButtonPressed(Enum.UserInputType.MouseButton1)then
            Cam.CameraType = Enum.CameraType.Scriptable
            Cam.CFrame = CFrame.new(Vector3.new(0,10,0),Vector3.new(0,0,0))
            ContextActionService:BindActionAtPriority("MoveForward",MoveForward,false,Enum.KeyCode.W,2500)
        end
    end
end)

it says the error is on line fifteen and i assume its talking about the last argument 2500 Also it says on the error message Unable to cast token int