How to eliminate "two-stage rotation" warning?

My window's rootViewController is a UINavigationController Then.. In this navigation controller's rootViewController, I popup a modal view(a UITabBarController)

something like this:

UIWindow
->UINavigationController
-->MyFirstViewController<--In this class I run following code

[self.navigationController presentModalViewController:tabController animated:YES];

Then the debugger warning :Using two-stage rotation animation is not supported when rotating more than one view controller or view controllers not the window delegate

However, if the modal view is not tabController this warning does not appear.

What will this behavior do harm to the application when I popup tabController modal view in a navigation controller?

Or I should find another way to do this?

I found several similar questions on this site, but I don't get it...