In Partner Login, Server error observed while viewing Employee Plan Eligibility Report. PFA screen shot and error log

Exception : Cannot bulk load because the file "\\192.168.31.12\WorkTerra\Reports\BulkInsert_anhngdmudfzb43y1mzmm3qt0.txt" could not be opened. Operating system error code 5(Access is denied.).
App Error Log : ControllerAppTier.SaveAndGetData->BenAdminControllerAppTier.SaveAndGetData->StaticReports.SaveAndGetData->AdminUser.GetData->EligibilityReason.FetchEmployeePlanEligibility->EligibilityReason.CheckEligibilityForAllCriteria->EligibilityReason.UpdateDatabase
Employee ID : 0
Action Name : GridPreviewReport
Model : System.Web.Mvc.HandleErrorInfo
Controller : Report
Web Error Log : at WORKTERRA.BenAdmin.BenAdminControllerWebTier.SaveAndGetData(ObjectType I_objectType, Object objInputObject, Object I_context, Hashtable I_criteria, Boolean I_mode, Boolean I_needCollection)
at WORKTERRA.BenAdmin.Areas.Report.Models.StaticReports.PreviewReport()
at WORKTERRA.BenAdmin.Areas.Report.Controllers.ReportController.GridPreviewReport(Int32 id, Int32 id1, Int32 id2, Int32 id3, Int32 id4)
at lambda_method(Closure , ControllerBase , Object[] )
at System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters)
at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters)
at System.Web.Mvc.ControllerActionInvoker.<>c_DisplayClass13.b_10()
at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation)
at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation)
at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodWithFilters(ControllerContext controllerContext, IList`1 filters, ActionDescriptor actionDescriptor, IDictionary`2 parameters)
at System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName)