unity game engine - Trying to Hide Gameobject giving Error - UnassignedReferenceException: UNITY3D - Stack Overflow

I am new to unity & trying to make small POC in MRTK. As a part of POC, I need to hide the Object when the button is clicked. Once Button is clicked it updates the current position of the Cube

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unity game engine - I'm getting an UnassignedReferenceException when the reference is set. I've seen other questions similar but not exactly the same - Stack Overflow