<Error> CGAffineTransformInvert: singular matrix on UIImagePicker

<Error>: CGAffineTransformInvert: singular matrix on UIImagePicker
PLCropOverlay" is the layer I want to hide.

    /*     PLCropOverlay : capture panel     PLPreviewOverlayView: control panel     */    view = ((UIViewController*)[imagePickerController.viewControllers objectAtIndex:0]).view;    NSLog(@"%@",view.subviews);    for (UIView *subview in view.subviews) {        NSLog(@"sub2:%@", subview);        if([NSStringFromClass([subview class]) isEqualToString:@"PLPreviewOverlayView"] ||           [NSStringFromClass([subview class]) isEqualToString:@"PLCropOverlay"]){            subview.hidden = YES;//            [subview removeFromSuperview];            NSLog(@"******************** hide");        }    }

??Using the code above can resolve the singular matrix error.

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