visual studio 2013 IIS express windows authentication

Hi All,

    I am migrating the applications from visual studio 2008 to visual studio 2013.Most of the applications on windows authentication mode enabled.Windows authentication mode not working few applications getting the "Object reference not set to an instance of an object "even i have changed the IIS express  settings based on the below URL.

http://blogs.microsoft.co.il/gilf/2015/01/01/enabling-windows-authentication-in-iisexpress/

Few applications its working fine.

Highly appreciated your help.