Magic Brush sample crash with error EXC_BAD_ACCESS code=1

[yeejoe]

Question as title, after i initialise a new object like this, it crash. May i know what is the problem?

AdobeLabsMagicBrush * magicBrush = [[AdobeLabsMagicBrush alloc] initWithCanvasSize:CGSizeMake(300, 300)];

[dummylung]

Same Here