Mensaje de error al guardar evaluacion de candidato

Al querer guardar una evaluación de candidato y haber llenado todos los registros que son obligatorios me muestra el siguiente mensaje en la versión 1.19.1.6

System.FormatException: Input string was not in a correct format.
at System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer& number, NumberFormatInfo info, Boolean parseDecimal)
at System.Number.ParseInt32(String s, NumberStyles style, NumberFormatInfo info)
at System.Convert.ToInt32(String value)
at Aseinfo.VH4.Reclutamiento.Controllers.ConcursoSeleccionController.CompletarProcesoCalculoNotaCompetencia(CandidatoConcurso candidatoConcurso, EvaluacionCandidato entity, Boolean inserting, Boolean esDelete) in C:\vh4\VH4\Reclutamiento\Controllers\ConcursoSeleccionController.cs:line 7100
at Aseinfo.VH4.Reclutamiento.Controllers.ConcursoSeleccionController.SavePruebaCandidatoConcurso(EvaluacionCandidato entity, Boolean inserting, Int32 codigoCandidato, Int32 codigoEtapa, Int32 codigoPruebaCandidato, Nullable`1 codigoEmpleoResponsable, Nullable`1 codigoResultado, String codigoMoneda, Boolean tieneCosto, Int32 codigoGrupo, Nullable`1 codigoEscalaPrueba, Nullable`1 codigoDetalleEscala, List`1 listadoEvaluacionesCompetencia) in C:\vh4\VH4\Reclutamiento\Controllers\ConcursoSeleccionController.cs:line 6325
at Aseinfo.VH4.Reclutamiento.Controllers.ConcursoSeleccionController.EditPruebaCandidatoConcursoPost(EvaluacionCandidato entity, Nullable`1 fechaPlanificada, Nullable`1 fechaRealizada, Int32 codigoCandidato, Int32 codigoEtapa, Int32 codigoPruebaCandidato, Nullable`1 codigoEmpleoResponsable, Nullable`1 codigoResultado, String codigoMoneda, Boolean tieneCosto, Int32 codigoGrupo, Nullable`1 codigoEscalaPrueba, Nullable`1 codigoDetalleEscala, List`1 listadoEvaluacionesCompetencia) in C:\vh4\VH4\Reclutamiento\Controllers\ConcursoSeleccionController.cs:line 5317
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.<>c.<BeginInvokeSynchronousActionMethod>b__9_0(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.AsyncControllerActionInvoker.EndInvokeActionMethod(IAsyncResult asyncResult)
at System.Web.Mvc.Async.AsyncControllerActionInvoker.AsyncInvocationWithFilters.<>c__DisplayClass11_0.<InvokeActionMethodFilterAsynchronouslyRecursive>b__0()
at System.Web.Mvc.Async.AsyncControllerActionInvoker.AsyncInvocationWithFilters.<>c__DisplayClass11_2.<InvokeActionMethodFilterAsynchronouslyRecursive>b__2()
at System.Web.Mvc.Async.AsyncControllerActionInvoker.AsyncInvocationWithFilters.<>c__DisplayClass11_2.<InvokeActionMethodFilterAsynchronouslyRecursive>b__2()
at System.Web.Mvc.Async.AsyncControllerActionInvoker.AsyncInvocationWithFilters.<>c__DisplayClass11_2.<InvokeActionMethodFilterAsynchronouslyRecursive>b__2()
at System.Web.Mvc.Async.AsyncControllerActionInvoker.AsyncInvocationWithFilters.<>c__DisplayClass11_2.<InvokeActionMethodFilterAsynchronouslyRecursive>b__2()
at System.Web.Mvc.Async.AsyncControllerActionInvoker.AsyncInvocationWithFilters.<>c__DisplayClass11_2.<InvokeActionMethodFilterAsynchronouslyRecursive>b__2()
at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass7_0.<BeginInvokeActionMethodWithFilters>b__1(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.AsyncControllerActionInvoker.EndInvokeActionMethodWithFilters(IAsyncResult asyncResult)
at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass3_6.<BeginInvokeAction>b__4()
at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass3_1.<BeginInvokeAction>b__1(IAsyncResult asyncResult)

Y colocando la consola del navegador me lanza el siguiente mensaje:

jquery-1.9.1.min.js?…36368291060000000:5 POST http://localhost/Reclutamiento/ConcursoSeleccion/EditPruebaCandidatoConcursoPost 500 (Internal Server Error)
send    @   jquery-1.9.1.min.js?…36368291060000000:5
ajax    @   jquery-1.9.1.min.js?…36368291060000000:5
b.<computed>    @   jquery-1.9.1.min.js?…36368291060000000:5
SendForm    @   8:425
onclick @   8:1