Why is glReadPixels() failing in this code in iOS 6.0?

by 
CAEAGLLayer *eaglLayer = (CAEAGLLayer *) self.layer;
eaglLayer.drawableProperties = @{
    kEAGLDrawablePropertyRetainedBacking: [NSNumber numberWithBool:YES],
    kEAGLDrawablePropertyColorFormat: kEAGLColorFormatRGBA8
};

set 

kEAGLDrawablePropertyRetainedBacking = YES

(I do not know why this tip is going well..///)

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