Index: trunk/src/MStab/IO/Classic/Calculation.cs
===================================================================
diff -u -r7 -r111
--- trunk/src/MStab/IO/Classic/Calculation.cs	(.../Calculation.cs)	(revision 7)
+++ trunk/src/MStab/IO/Classic/Calculation.cs	(.../Calculation.cs)	(revision 111)
@@ -2,6 +2,7 @@
 using System.Diagnostics;
 using System.Runtime.Serialization;
 using Deltares.Geotechnics;
+using Deltares.Geotechnics.Soils;
 using Deltares.Stability;
 
 namespace Deltares.MStab.IO.Classic