diff --git a/src/edu/nps/moves/dis7/utilities/PduFactory.java b/src/edu/nps/moves/dis7/utilities/PduFactory.java
index 2ce50f2b6ae8e98683742057f315a17e9f41669f..506bca3653f8e42df182f8226b04d6306ac742a8 100644
--- a/src/edu/nps/moves/dis7/utilities/PduFactory.java
+++ b/src/edu/nps/moves/dis7/utilities/PduFactory.java
@@ -1814,6 +1814,7 @@ public class PduFactory
         }
         catch (Exception ex) {
           System.err.println("error unmarshalling " + pduType);
+          System.err.println(ex);
         }
         buff.position(pos);         // Reset buffer
       }