Index: django/core/urlresolvers.py
===================================================================
--- django/core/urlresolvers.py (revision 6194)
+++ django/core/urlresolvers.py (working copy)
@@ -233,6 +233,8 @@
                     sub_match = pattern.resolve(new_path)
                 except Resolver404, e:
                     tried.extend([(pattern.regex.pattern + '   ' + t) for t in e.args[0]['tried']])
+                except ImportError, e:
+                    raise AttributeError('included urlpattern "%s" not found' % pattern.urlconf_name)
                 else:
                     if sub_match:
                         sub_match_dict = dict([(smart_str(k), v) for k, v in match.groupdict().items()])