Error al crear requisición de personal. Opción Plazas vacantes

Un cliente reportó un error en el ELMAH al momento de crear una requisión de personal de tipo plazas vacantes, lo que sucede es que al momento de seleccionar "Plazas Vacantes" muestra nada mas la imagen de procesando (En mi máquina si funciona con el mismo usuario y en una máquina de it del cliente también).

Object reference not set to an instance of an object. 
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System.NullReferenceExceptionObject reference not set to an instance of an object.
System.NullReferenceException: Object reference not set to an instance of an object.
   at Aseinfo.VH4.Reclutamiento.Controllers.RequisicionPersonalController.PrepararEntidadParaTipoNuevaPlaza(RequisicionPersonal requisicionPersonal, Nullable`1 codigoPuesto, List`1 personasAContratar) in c:\BuildAgent\work\608d469cc106b504\VH4\Reclutamiento\Controllers\RequisicionPersonalController.cs:line 1789
   at Aseinfo.VH4.Reclutamiento.Controllers.RequisicionPersonalController.SaveRequisicionPersonal(RequisicionPersonal entity, Nullable`1 codigoGrupo, Nullable`1 codigoCompaniaPlaza, Nullable`1 codigoPuesto, Nullable`1 codigoCategoriaPuesto, Nullable`1 codigoNivelComportamiento, Nullable`1 codigoUnidad, Nullable`1 codigoCentroTrabajo, Nullable`1 codigoTipoContrato, Nullable`1 codigoEmpleoSolicita, String codigoAlternativo, List`1 requisitosPuestoNuevo, List`1 codigosCondicionesLaborales, List`1 plazasEmpleos, List`1 detallesPersonasAContratar, Boolean inserting, Nullable`1 iniciaFlujo) in c:\BuildAgent\work\608d469cc106b504\VH4\Reclutamiento\Controllers\RequisicionPersonalController.cs:line 1123
   at Aseinfo.VH4.Reclutamiento.Controllers.RequisicionPersonalController.Create(RequisicionPersonal entity, Nullable`1 codigoGrupo, Nullable`1 codigoCompaniaPlaza, Nullable`1 codigoPuesto, Nullable`1 codigoCategoriaPuesto, Nullable`1 codigoNivelComportamiento, Nullable`1 codigoUnidad, Nullable`1 codigoCentroTrabajo, Nullable`1 codigoTipoContrato, Nullable`1 codigoEmpleoSolicita, String codigoAlternativo, List`1 requisitosPuestoNuevo, List`1 codigosCondicionesLaborales, List`1 plazasEmpleos, List`1 detallesPersonasAContratar, Nullable`1 iniciaFlujo) in c:\BuildAgent\work\608d469cc106b504\VH4\Reclutamiento\Controllers\RequisicionPersonalController.cs:line 510
   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__DisplayClass15.<invokeactionmethodwithfilters>b__12()
   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.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)

Logged on martes, 07 de enero de 2014 at 03:56:14 p.m.
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