<Error>: CGAffineTransformInvert: singular matrix on UIImagePicker

If the showsCameraControls is set to NO and change the orientation of the device, in the XCode console there will be a error message, even if the app do not support to change orientation.

<Error>: CGAffineTransformInvert: singular matrix

I track the code and find the it trigger this erro in CGAffineTransformInvert function, but have no souce code of this function. Firstly I try to remove any orientation changed notification of the UIImagePicker, but find it have not observer. Then I try to find out the view layout of the pick, list bellow:

UILayoutContainerView {{0, 0}, {320, 480}}
{
	UINavigationTransitionView {{0, 0}, {320, 480}}
	{
		UIViewControllerWrapperView {{0, 0}, {320, 480}}
		{
			PLCameraView {{0, 0}, {320, 480}}
			{
				UIView {{0, 0}, {320, 480}}
				{
					PLCameraPreviewView {{0, 1}, {320, 426}}
					{
						UIView {{0, 0}, {320, 426}}
						{
							UIView {{0, 0}, {320, 426}}
							{
								UIView {{0, 0}, {320, 426}}
							}
							UIView {{0, 0}, {320, 426}}
						}
					}
				}
				PLPreviewOverlayView {{0, 0}, {320, 427}}
				{
					PLCameraFlashButton {{10, 10}, {81, 35}}
					{
						UIImageView {{0, 0}, {81, 35}}
						UIImageView {{10, 7.5}, {15, 20}}
						PLCameraOverlayButtonLabel {{30, 8}, {35, 19}}
						PLCameraOverlayButtonLabel {{65, 8}, {0.0022, 19}}
						PLCameraOverlayButtonLabel {{66.0022, 8}, {0.0023, 19}}
						PLCameraFlashButtonSpacerView {{65, 1}, {0, 33}}
						PLCameraFlashButtonSpacerView {{65.0022, 1}, {1, 33}}
					}
					PLCameraToggleButton {{240, 10}, {70, 35}}
					{
						UIImageView {{0, 0}, {70, 35}}
						UIImageView {{10, 5}, {50, 25}}
					}
					UIView {{160, 417}, {0, 0}}
				}
				UIImageView {{0, 0}, {320, 480}}
				UIImageView {{0, 422}, {320, 5}}
				PLCropOverlay {{0, 0}, {320, 480}}
				{
					PLCameraIrisAnimationView {{0, 0}, {320, 480}}
					PLCropOverlayBottomBar {{0, 427}, {320, 53}}
					{
						UIImageView {{320, 0}, {320, 53}}
						{
							PLCropOverlayBottomBarButton {{0, 0}, {71, 41}}
							{
								UIImageView {{0, 0}, {71, 41}}
								UIButtonLabel {{15, 10.5}, {41, 15}}
							}
							PLCropOverlayBottomBarButton {{0, 0}, {56, 41}}
							{
								UIImageView {{0, 0}, {56, 41}}
								UIButtonLabel {{0, 17.5}, {0, 0}}
							}
						}
						UIImageView {{0, 0}, {320, 53}}
						{
							PLCameraButton {{110, 6}, {100, 41}}
							{
								UIView {{37, 10}, {26, 21}}
								{
									UIImageView {{0, 0}, {26, 21}}
								}
							}
							PLCropOverlayBottomBarButton {{6, 8.5}, {70, 41}}
							{
								UIImageView {{0, 0}, {70, 41}}
								UIButtonLabel {{15, 10.5}, {40, 15}}
							}
						}
					}
				}
			}
		}
	}
}

 The function I use to detact view's layout:

-(void)detactSubview:(UIView *)view layer:(int)layer buffer:(NSMutableString*)buffer{
    NSMutableString *s = [[NSMutableString alloc] init];
    for (int i=0; i<layer; i++) {
        [s appendString:@"\t"];
    }
    NSString *sName = NSStringFromClass([view class]);
    [buffer appendFormat:@"%@%@ %@\n",s,sName, NSStringFromCGRect(view.frame)];
    if(view.subviews.count>0){
        [buffer appendFormat:@"%@{\n",s];
        layer++;
        for(UIView *subView in view.subviews){
            [self detactSubview:subView layer:layer buffer:buffer];
        }
        [buffer appendFormat:@"%@}\n",s];
    }
}

I find that "PLPreviewOverlayView" and "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.