Index: /trunk/autoquest-core-events/src/main/java/de/ugoe/cs/autoquest/eventcore/guimodel/GUIModel.java
===================================================================
--- /trunk/autoquest-core-events/src/main/java/de/ugoe/cs/autoquest/eventcore/guimodel/GUIModel.java	(revision 1359)
+++ /trunk/autoquest-core-events/src/main/java/de/ugoe/cs/autoquest/eventcore/guimodel/GUIModel.java	(revision 1360)
@@ -345,5 +345,7 @@
             if (!parent.equals(parentNode)) {
                 throw new IllegalArgumentException("GUI elements do not share the same parent: " +
-                                                   parent + " <> " + parentNode);
+                                                   parent + " (parent of " + guiElements.get(0) +
+                                                   ") <> " + parentNode + " (parent of " +
+                                                   element + ")");
             }
         }