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Mac Mini Penguin Sample, NullReferenceException

Vuforia SDK Version: 5.06 -Description with steps to reproduce:

NullReferenceException: Object reference not set to an instance of an objectUIStateManager.OnGUI () (at Assets/Scripts/UIStateManager.cs:100)

 

It worked on windows64 bit os and 32 bit unity3d. But on the mac mini, it showed this error. Can you help me? How to solve this.

-Development OS (Mac OS X, Windows, Linux): Mac OS X -Mobile OS and Version: Android -Mobile Device Manufacturer and Model name: Moto -Do the Vuforia Sample Applications show the same behavior?: Yes, it is the smart terrain penguin sample.