“Application windows are expected to have a root view controller at the end of application launch” error when running a project with Xcode 7, iOS 9

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From your error message:

Application windows are expected to have a root view controller at the end of application launch

How old is this “old” project? If it’s more than a few years, do you still have:

[window addSubview:viewController.view];

You should instead replace it with:

[window setRootViewController:viewController];

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