Index: src/Plugins/Wti/Wti.Service/PipingCalculationService.cs
===================================================================
diff -u -r49b7320ad56bfa60788e8792b79dd537318f68ff -rfcedd294bc5bb311a5612e0b07b3fc4149456c54
--- src/Plugins/Wti/Wti.Service/PipingCalculationService.cs	(.../PipingCalculationService.cs)	(revision 49b7320ad56bfa60788e8792b79dd537318f68ff)
+++ src/Plugins/Wti/Wti.Service/PipingCalculationService.cs	(.../PipingCalculationService.cs)	(revision fcedd294bc5bb311a5612e0b07b3fc4149456c54)
@@ -49,18 +49,18 @@
             PipingDataLogger.Info(String.Format(Resources.ValidationStarted_0, DateTimeService.CurrentTimeAsString));
 
             var validationResults = new PipingCalculation(CreateInputFromData(pipingData)).Validate();
-            LogMessagesAsError(validationResults.ToArray());
+            LogMessagesAsError(Resources.ErrorInPipingValidation_0, validationResults.ToArray());
 
             PipingDataLogger.Info(String.Format(Resources.ValidationEnded_0, DateTimeService.CurrentTimeAsString));
 
             return validationResults.Count > 0 ? PipingCalculationResult.ValidationErrors : PipingCalculationResult.Successful;
         }
 
-        private static void LogMessagesAsError(params string[] errorMessages)
+        private static void LogMessagesAsError(string format, params string[] errorMessages)
         {
             foreach (var errorMessage in errorMessages)
             {
-                PipingDataLogger.Error(string.Format(Resources.ErrorInPipingCalculation_0, errorMessage));
+                PipingDataLogger.Error(string.Format(format, errorMessage));
             }
         }
 
@@ -86,7 +86,7 @@
             }
             catch (PipingCalculationException e)
             {
-                LogMessagesAsError(e.Message);
+                LogMessagesAsError(Resources.ErrorInPipingCalculation_0, e.Message);
                 return PipingCalculationResult.CalculationErrors;
             }
             finally
Index: src/Plugins/Wti/Wti.Service/Properties/Resources.Designer.cs
===================================================================
diff -u -r49b7320ad56bfa60788e8792b79dd537318f68ff -rfcedd294bc5bb311a5612e0b07b3fc4149456c54
--- src/Plugins/Wti/Wti.Service/Properties/Resources.Designer.cs	(.../Resources.Designer.cs)	(revision 49b7320ad56bfa60788e8792b79dd537318f68ff)
+++ src/Plugins/Wti/Wti.Service/Properties/Resources.Designer.cs	(.../Resources.Designer.cs)	(revision fcedd294bc5bb311a5612e0b07b3fc4149456c54)
@@ -88,6 +88,15 @@
         }
         
         /// <summary>
+        ///   Looks up a localized string similar to Validatie mislukt: {0}.
+        /// </summary>
+        internal static string ErrorInPipingValidation_0 {
+            get {
+                return ResourceManager.GetString("ErrorInPipingValidation_0", resourceCulture);
+            }
+        }
+        
+        /// <summary>
         ///   Looks up a localized string similar to Validatie beëindigd om: {0}.
         /// </summary>
         internal static string ValidationEnded_0 {
Index: src/Plugins/Wti/Wti.Service/Properties/Resources.resx
===================================================================
diff -u -r49b7320ad56bfa60788e8792b79dd537318f68ff -rfcedd294bc5bb311a5612e0b07b3fc4149456c54
--- src/Plugins/Wti/Wti.Service/Properties/Resources.resx	(.../Resources.resx)	(revision 49b7320ad56bfa60788e8792b79dd537318f68ff)
+++ src/Plugins/Wti/Wti.Service/Properties/Resources.resx	(.../Resources.resx)	(revision fcedd294bc5bb311a5612e0b07b3fc4149456c54)
@@ -126,6 +126,9 @@
   <data name="ErrorInPipingCalculation_0" xml:space="preserve">
     <value>Piping berekening niet gelukt: {0}</value>
   </data>
+  <data name="ErrorInPipingValidation_0" xml:space="preserve">
+    <value>Validatie mislukt: {0}</value>
+  </data>
   <data name="ValidationEnded_0" xml:space="preserve">
     <value>Validatie beëindigd om: {0}</value>
   </data>