I seem to have run into to a wall that I can't get passed. I have moved an Episite to IIS 7.5 from IIS 6 and also upgraded from cms 5 to 6. I now get the following exception when I start it. I am certain that there is something missing in my web.config but I can't for the * of it figure out what it is. All help is greatly appreciated.

System.TypeInitializationException: The type initializer for 'EPiServer.Security.PrincipalInfo' threw an exception. ---> System.NullReferenceException: Object reference not set to an instance of an object.
           at EPiServer.Configuration.Settings.get_Instance()
           at EPiServer.UriSupport.get_InternalUIUrl()
           at EPiServer.UriSupport.get_UIUrl()
           at EPiServer.UriSupport.ResolveUrlFromUIBySettings(String path)
           at EPiServer.Security.PrincipalInfo..cctor()
           --- End of inner exception stack trace ---
           at EPiServer.Security.PrincipalInfo.get_CurrentPrincipal()
           at EPiServer.Security.VirtualRolePrincipal.VirtualRolePrincipal_PostAuthenticateRequest(Object sender, EventArgs e)
           at System.Web.HttpApplication.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
           at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)