Marquette - employee login- enroll now - getting error

a92917
Password@1
Marquette
Steps:-
Go to enroll now page- first it was displaying only one plan > enroll in that plan click download EOI form > Page log out- Now login into system and getting two plan and on clicking keep plan button of first plan getting server error

error log-
Exception : Collection index must be in the range 1 to the size of the collection.
App Error Log : -
Employee ID : 23327
Action Name : LoadBenefitsEliigiblePlans
Model : System.Web.Mvc.HandleErrorInfo
Controller : UserDetails
Web Error Log : at Microsoft.VisualBasic.Collection.IndexCheck(Int32 Index)
at Microsoft.VisualBasic.Collection.get_Item(Int32 Index)
at ASP._Page_Areas_UserDetails_Views_UserDetails_EnrollNow_EnrollNowV2LoadPlans_cshtml.Execute() in e:\WorkterraWeb\BenAdmin\Areas\UserDetails\Views\UserDetails\EnrollNow\EnrollNowV2LoadPlans.cshtml:line 730
at System.Web.WebPages.WebPageBase.ExecutePageHierarchy()
at System.Web.Mvc.WebViewPage.ExecutePageHierarchy()

n downloading file:- error log

Exception : The remote host closed the connection. The error code is 0x800703E3.
App Error Log : -
Employee ID : 23327
Action Name : DownloadFile
Model : System.Web.Mvc.HandleErrorInfo
Controller : Common
Web Error Log : at System.Web.Hosting.IIS7WorkerRequest.RaiseCommunicationError(Int32 result, Boolean throwOnDisconnect)
at System.Web.Hosting.IIS7WorkerRequest.ExplicitFlush()
at System.Web.HttpResponse.Flush(Boolean finalFlush, Boolean async)
at System.Web.HttpResponse.Flush()
at System.Web.HttpResponseWrapper.Flush()