Index: Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Service/GrassCoverErosionInwardsCalculationService.cs
===================================================================
diff -u -r04d96e936610eab56e9ddc09c055526efe9b9652 -r3d9b418d483c122040e11a7e074d666c64e9d7b5
--- Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Service/GrassCoverErosionInwardsCalculationService.cs	(.../GrassCoverErosionInwardsCalculationService.cs)	(revision 04d96e936610eab56e9ddc09c055526efe9b9652)
+++ Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Service/GrassCoverErosionInwardsCalculationService.cs	(.../GrassCoverErosionInwardsCalculationService.cs)	(revision 3d9b418d483c122040e11a7e074d666c64e9d7b5)
@@ -21,6 +21,7 @@
 
 using System.Collections.Generic;
 using System.Linq;
+using log4net;
 using Ringtoets.Common.Data.AssessmentSection;
 using Ringtoets.Common.Data.FailureMechanism;
 using Ringtoets.Common.Service;
@@ -29,6 +30,7 @@
 using Ringtoets.HydraRing.Calculation.Data;
 using Ringtoets.HydraRing.Calculation.Data.Input.Overtopping;
 using Ringtoets.HydraRing.Calculation.Data.Output;
+using Ringtoets.HydraRing.Calculation.Parsers;
 using Ringtoets.HydraRing.Calculation.Services;
 using Ringtoets.HydraRing.IO;
 using RingtoetsCommonServiceResources = Ringtoets.Common.Service.Properties.Resources;
@@ -40,6 +42,8 @@
     /// </summary>
     public static class GrassCoverErosionInwardsCalculationService
     {
+        private static readonly ILog log = LogManager.GetLogger(typeof(GrassCoverErosionInwardsCalculationService));
+
         /// <summary>
         /// Performs validation over the values on the given <paramref name="calculation"/>. Error and status information is logged during
         /// the execution of the operation.
@@ -67,12 +71,38 @@
                                                                          string ringId, GeneralGrassCoverErosionInwardsInput generalInput)
         {
             OvertoppingCalculationInput input = CreateInput(calculation, failureMechanismSection, generalInput);
+            var exceedanceProbabilityCalculationParser = new ExceedanceProbabilityCalculationParser();
 
-            return CalculationServiceHelper.PerformCalculation(calculation.Name,
-                                                               () => HydraRingCalculationService.PerformCalculation(hlcdDirectory, ringId, HydraRingTimeIntegrationSchemeType.FerryBorgesCastanheta, HydraRingUncertaintiesType.All, input),
-                                                               Resources.GrassCoverErosionInwardsCalculationService_Calculate_Error_in_grass_cover_erosion_inwards_0_calculation);
+            CalculationServiceHelper.PerformCalculation(
+                calculation.Name,
+                () =>
+                {
+                    HydraRingCalculationService.PerformCalculation(
+                        hlcdDirectory,
+                        ringId,
+                        HydraRingTimeIntegrationSchemeType.FerryBorgesCastanheta,
+                        HydraRingUncertaintiesType.All,
+                        input,
+                        new[]
+                        {
+                            exceedanceProbabilityCalculationParser
+                        });
+
+                    VerifyOutput(exceedanceProbabilityCalculationParser.Output, calculation.Name);
+                });
+
+            return exceedanceProbabilityCalculationParser.Output;
         }
 
+        private static void VerifyOutput(ExceedanceProbabilityCalculationOutput output, string name)
+        {
+            if (output == null)
+            {
+                log.ErrorFormat(Resources.GrassCoverErosionInwardsCalculationService_Calculate_Error_in_grass_cover_erosion_inwards_0_calculation, name);
+            }
+        }
+
+
         private static OvertoppingCalculationInput CreateInput(GrassCoverErosionInwardsCalculation calculation, FailureMechanismSection failureMechanismSection, GeneralGrassCoverErosionInwardsInput generalInput)
         {
             return new OvertoppingCalculationInput(calculation.InputParameters.HydraulicBoundaryLocation.Id,