Tween makes screen black instead of actually moving

Help and Feedback Scripting Support
1

trying to tween the camera to look at the screen of this tool, instead the camera goes black

Heres the tween:

local FocusInfo = TweenInfo.new(1, Enum.EasingStyle.Back)
local Focus = tweenservice:Create(cam, FocusInfo, {CFrame = screen.CFrame})

Thanks

2

The target CFrame value is likely NaN