Lucky thing she came prepared for such a tough interview! Congratulations to her for landing the job!
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
[HttpException (0x80004005): Session state has created a session id, but cannot save it because the response was already flushed by the application.] System.Web.SessionState.SessionIDManager.SaveSessionID(HttpContext context, String id, Boolean& redirected, Boolean& cookieAdded) +617 System.Web.SessionState.SessionStateModule.CreateSessionId() +100 System.Web.SessionState.SessionStateModule.DelayedGetSessionId() +109 System.Web.SessionState.SessionStateModule.OnReleaseState(Object source, EventArgs eventArgs) +797 System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +223 System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) +220 System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +94