Server cannot modify cookies after HTTP headers have been sent
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): Server cannot modify cookies after HTTP headers have been sent.]
System.Web.HttpCookieCollection.Add(HttpCookie cookie) +99
DotNetNuke.Entities.Users.UserOnlineController.TrackAnonymousUser(HttpContext context) +825
DotNetNuke.Entities.Users.UserOnlineController.TrackUsers() +148
DotNetNuke.HttpModules.UsersOnline.UsersOnlineModule.OnAuthorizeRequest(Object s, EventArgs e) +285
System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +92
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +64
Pleased help!!!!!!!!