problem in creating buttons for augmented reality app

Unity Engine
1

i am trying to develope an AR app…for androiod and i just create the buttons, to gave some functionalities to my objects based on butttons using ONGUI after tracking the objects…but when i pressed buttons while running it shows the error like…

UnassignedReferenceException: The variable Cube of ImageTargetTrackableEventHandler has not been assigned.
You probably need to assign the Cube variable of the ImageTargetTrackableEventHandler script in the inspector.
ImageTargetTrackableEventHandler.OnGUI () (at Assets/Scripts/ImageTargetTrackableEventHandler.cs:136)

2

There are a lot of error message in Unity, and some of them are cryptic and really unhelpful.

This is not one of them… it tells you exactly what you need to do.

3

thank u for your reply, ya i made mistake in my inspector…now i correted it