diff -r 6641e941ef1e -r ff1a9aa48cfd app/django/core/exceptions.py
--- a/app/django/core/exceptions.py	Tue Oct 14 12:36:55 2008 +0000
+++ b/app/django/core/exceptions.py	Tue Oct 14 16:00:59 2008 +0000
@@ -32,3 +32,6 @@
     """Some kind of problem with a model field."""
     pass
 
+class ValidationError(Exception):
+    """An error while validating data."""
+    pass