diff --git a/product/ERP5Type/Core/Folder.py b/product/ERP5Type/Core/Folder.py
index 73c0dc52f01a78835802d3d823136c6332604bdd..301bee4d8bd028d59e219a8cb5be123df09fc8bd 100644
--- a/product/ERP5Type/Core/Folder.py
+++ b/product/ERP5Type/Core/Folder.py
@@ -508,7 +508,7 @@ class Folder(CopyContainer, CMFBTreeFolder, CMFHBTreeFolder, Base, FolderMixIn,
           self._folder_handler = "%r" % plugin
           break
       if self._folder_handler is None:
-        raise ValueError, 'No plugin defined'
+        raise ValueError, 'No plugin defined on %r' % (self, )
       
   def newContent(self, *args, **kw):
     """ Create a new content """