TweenService Unable to cast to Dictionary error?

I am trying to tween the camera and I get the error:

14:19:02.083 - Unable to cast to Dictionary
14:19:02.084 - Stack Begin
14:19:02.084 - Script 'Players.parker02311.PlayerGui.bookingSGUI.bookingHandler', Line 111
14:19:02.085 - Stack End

My code is

cam.CameraType = Enum.CameraType.Scriptable
local TI = TweenInfo.new(5, Enum.EasingStyle.Quad, Enum.EasingDirection.In)
local Goal = CFrame.new(game.Workspace.Screen1Cam.Position)
local Animation = tween:Create(cam, TI, Goal)
Animation:Play()