from coalib.parsing.filters import available_filters


class InvalidFilterException(Exception):
    def __init__(self, filter_name):
        super().__init__('{!r} is an invalid filter. Available filters: {}'
                         .format(filter_name,
                                 ', '.join(sorted(available_filters))))

@@ -77,25 +77,27 @@
 ception(
-Exception
+LookupError
 ):%0A    d

Change base class