I always get this error whenever I'm trying to turn off / on object, what does it mean exactly? Is this still a bug? Because some objects can't be turned off
What is it exactly you want to do to the GameObject? "TurnOff" refers to a function within the Hotspot script - that's why it doesn't give an error when used. If you want to remove the object, you can you the Object: Add or remove Action.
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http://www.adventurecreator.org/forum/discussion/2201/from-off-turn-it-on#latest