I keep get the error "Can only tween objects in the workspace" when tween a frame using :TweenSize()

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#1

When I try to tween the size of a frame inside of a billboard Gui in player Gui addorneed to a part, I keep getting this same error: Can only tween objects in the workspace. But the tweening works fine with other things in player Gui.
My script:

PopupGui.InteractionFrame.InteractButton:TweenSize(
					UDim2.new(1.3, 0,1.3, 0),
					"Out",
					"Quad",
					.1,
					true
				)