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Exception: Graph builder was null!

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Hello @ll,
 
I just tried to compile the newest version of Touchless SDK. It's working great, but when I change the webcam (I have two) I'm getting an exception "Graph builder was null!". Then I need to restart the application and it'll work great again, till I try to change my webcam. Any idea what the problem is?
 
Thank for all your work! ;)
 
Michael
 
PS. If you need addition information, just ask!

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