Index: dam engine/trunk/src/Deltares.DamEngine.Calculators/KernelWrappers/DamMacroStability/DamMacroStabilityKernelWrapper.cs
===================================================================
diff -u -r670 -r672
--- dam engine/trunk/src/Deltares.DamEngine.Calculators/KernelWrappers/DamMacroStability/DamMacroStabilityKernelWrapper.cs	(.../DamMacroStabilityKernelWrapper.cs)	(revision 670)
+++ dam engine/trunk/src/Deltares.DamEngine.Calculators/KernelWrappers/DamMacroStability/DamMacroStabilityKernelWrapper.cs	(.../DamMacroStabilityKernelWrapper.cs)	(revision 672)
@@ -28,18 +28,19 @@
         /// </summary>
         /// <param name="damKernelInput">The dam kernel input.</param>
         /// <returns></returns>
-        public IKernelDataInput Prepare(DamKernelInput damKernelInput)
+        public PrepareResult Prepare(DamKernelInput damKernelInput, out IKernelDataInput kernelDataInput)
         {
             // TODO: this is just fake data
             const string testFolder = @"..\..\Deltares.DamEngine.Calculators.Tests\Files\MacroStability";
             // Relative paths in ini file do not work yet in DGeoStability 16.2. This is fixed in 18.1.
             var absoluteFolder = Path.GetFullPath(Path.Combine(Directory.GetCurrentDirectory(), testFolder));
             var stiFileName = Path.Combine(absoluteFolder, "test.sti");
-            return new DamMacroStabilityInput()
+            kernelDataInput = new DamMacroStabilityInput()
             {
                 DGeoStabilityExePath = Path.Combine(DamMacroStabilityFolder, DGeoStabilityExe),
                 DGeoStabilityInputFileName = stiFileName
             };
+            return PrepareResult.Successful;
         }
 
         /// <summary>