diff --git a/src/main/java/no/nibio/vips/core/service/ModelResourceImpl.java b/src/main/java/no/nibio/vips/core/service/ModelResourceImpl.java
index e13f9267530567a8440ee648a44334e97abc4e85..2741592d5e8bf3cb5af5462d47e3b921d6b27249 100755
--- a/src/main/java/no/nibio/vips/core/service/ModelResourceImpl.java
+++ b/src/main/java/no/nibio/vips/core/service/ModelResourceImpl.java
@@ -343,7 +343,7 @@ public class ModelResourceImpl implements ModelResource{
             Logger.getLogger(ModelResourceImpl.class.getName()).log(Level.SEVERE, null, ex);
             if(ex instanceof ConfigValidationException){
             
-                throw new WebApplicationException(Response.status(Response.Status.BAD_REQUEST).entity(ex).build());
+                throw new WebApplicationException(Response.status(Response.Status.BAD_REQUEST).entity(ex.getMessage()).build());
             }
             else
             {