aid in starting asp.net configuration tool

 Greetings ...I would liketo help mein startingasp.net configuration tool...aparacethis error whenI start...

server error in '/asp.netwebadminisfiles' application
session state can only be used when enabledSeccionState is set true, either in a configuration file or n the Page directive. Please also make sure that System.Web.SessionStateModule or a  custon session state module is included in the <configurtion>/<system.web>/<httpModules> section in the application configuration

source error
            protected string CorrentRequesUrl{
                get{
                      Stack stack =(Stack) Seccion[URL_STACK];
                       if (stack !=null && stack.Count>0){
                         returns(string)stack.Peek();