replace exceptions by error messages

aman/types/Exception.py

@@ -1,13 +0,0 @@
-#!/usr/bin/env python
-
-class Error(Exception):
-    pass
-
-class FormatError(Error):
-    def __init__(self, message):
-        self.message = message
-
-class InputError(Error):
-    def __init__(self, expression, message):
-        self.expression = expression
-        self.message = message