Server Error on Enroll Now page when EE in BIRTH-ADOPTION QE workflow

Azure company -El Dorado For HSPL

551651730

User ID : almos1730/Test_123456

Step:-
1.Login with EE
2.Start OE
3.Complete OE
4.Raise QE - BIRTH-ADOPTION
5.Navigate to Enroll Now page

Actual - Server Error

Expected - It should display Plans on Enroll now page

Error Log -

Exception : Conversion from string "" to type `Date` is not valid.
App Error Log : ControllerAppTier.GetCollection->BenAdminControllerAppTier.GetData->CollectionManager.GetCollection->CollectionManager.GetEligibileBenefitTypesForGivenEffectiveDate->CollectionManager.GetPlanDesignInformationFromPlanDesignID_Flex_ForBenefitLoad->CollectionManager.GetAnnualSalaryOfEmployeeWithCompensation_Optimization
Employee ID : 9987
Action Name : LoadEligibleBenefitTypes
Model : System.Web.Mvc.HandleErrorInfo
Controller : UserDetails
Web Error Log : at WORKTERRA.BenAdmin.BenAdminControllerWebTier.GetCollection(ObjectType I_objectType, Hashtable I_criteria, String I_AdditionalCriteriaString, Object I_context, Boolean I_mode, Boolean I_needCollection)
at WORKTERRA.BenAdmin.Areas.UserDetails.Models.SelectBenefitTypePVModel.PopulateEligibileBenefitTypes()
at WORKTERRA.BenAdmin.Areas.UserDetails.Models.SelectBenefitTypePVModel.EffectiveDatesSelectedIndexChanged(String strEffectiveDate)
at WORKTERRA.BenAdmin.Areas.UserDetails.Controllers.UserDetailsController.LoadEligibleBenefitTypes(String Parameter1, String Parameter2, String Parameter3, String Parameter4, String Parameter5)
at lambda_method(Closure , ControllerBase , Object[] )
at System.Web.Mvc.ActionMethodDispatcher.Execute(ControllerBase controller, Object[] parameters)
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.Async.AsyncControllerActionInvoker.ActionInvocation.InvokeSynchronousActionMethod()
at System.Web.Mvc.Async.AsyncControllerActionInvoker.b__39(IAsyncResult asyncResult, ActionInvocation innerInvokeState)
at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResult`2.CallEndDelegate(IAsyncResult asyncResult)
at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResultBase`1.End()
at System.Web.Mvc.Async.AsyncResultWrapper.End[TResult](IAsyncResult asyncResult, Object tag)
at System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethod(IAsyncResult asyncResult)
at System.Web.Mvc.Async.AsyncControllerActionInvoker.AsyncInvocationWithFilters.b__3d()
at System.Web.Mvc.Async.AsyncControllerActionInvoker.AsyncInvocationWithFilters.<>c_DisplayClass46.b_3f()
at System.Web.Mvc.Async.AsyncControllerActionInvoker.AsyncInvocationWithFilters.<>c_DisplayClass46.b_3f()
at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c_DisplayClass33.b_32(IAsyncResult asyncResult)
at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResult`1.CallEndDelegate(IAsyncResult asyncResult)
at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResultBase`1.End()
at System.Web.Mvc.Async.AsyncResultWrapper.End[TResult](IAsyncResult asyncResult, Object tag)
at System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethodWithFilters(IAsyncResult asyncResult)
at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c_DisplayClass21.<>cDisplayClass2b.b_1c()
at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c_DisplayClass21.b_1e(IAsyncResult asyncResult)

(10:40) mahendra.mungase@harbingergroup.com: 551651730