On Pre-Stage, Server error observed on Demo company 'DCOB' on auto enroll benefits screen as View Change button clicked. With server error, user gets logged-out. PFA screen shot and error log.

Exception : Cannot bulk load because the file "\\192.168.31.12\WORKterra\Reports\BulkInsert_ACA_11_20_2016_10_23_08_PM.txt" could not be opened. Operating system error code 5(Access is denied.).
App Error Log : ControllerAppTier.SaveAndGetData->BenAdminControllerAppTier.SaveAndGetData->ACAautoEnrollBenefits.SaveAndGetData->ACAautoEnrollBenefits.CreateDataForViewAutoEnrollBenefit->ACAautoEnrollBenefits.UpdateDatabase
Employee ID : 0
Action Name : AutoEnrollBenefits
Model : System.Web.Mvc.HandleErrorInfo
Controller : ACA
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.ACA.Models.AutoEnrollBenefits.ViewChanges(AutoEnrollBenefits objAutoEnrollBenefits)
at WORKTERRA.BenAdmin.Areas.ACA.Controllers.ACAController.AutoEnrollBenefits(String action, AutoEnrollBenefits objAutoEnrollBenefits)
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)