Convert some old-style string exceptions to class exceptions.
diff --git a/Lib/multifile.py b/Lib/multifile.py
index cc8f43c..e43d331 100644
--- a/Lib/multifile.py
+++ b/Lib/multifile.py
@@ -30,7 +30,8 @@
 import sys
 import string
 
-Error = 'multifile.Error'
+class Error(Exception):
+	pass
 
 class MultiFile: