diff --git a/objets.py b/objets.py
index fc76290..b700b89 100644
--- a/objets.py
+++ b/objets.py
@@ -94,7 +94,12 @@ def new_cransldapobject(conn, dn, mode='ro', uldif=None, lockId=None):
         _, attrs = res[0]
         classe = ObjectFactory.get(attrs['objectClass'][0])
 
-    return classe(conn, dn, mode, uldif, lockId=lockId)
+    try:
+        _clas = classe(conn, dn, mode, uldif, lockId=lockId)
+    except Exception as e:
+        print "dn=%s,uldif=%r" % (dn, uldif)
+        raise
+    return _clas
 
 class CransLdapObject(object):
     """Classe de base des objets :py:class:`CransLdap`.