pg_dump error message

Joseph <lters@mrtc.com>

From: "Joseph" <lters@mrtc.com>
To: "Pgsql-General" <pgsql-general@postgresql.org>
Date: 2001-07-07T10:52:07Z
Lists: pgsql-general
Trying to do a dump I get this error:

pg_dump -v database > backup
--  last builtin oid is 1
--  reading user-defined types
--  reading user-defined functions
--  reading user-defined aggregates
getAggregates(): SELECT failed.  Explanation from backend: 'ERROR:
Attribute 'aggtransfn1' not found
'.

How can I repair this?

Postgres 7.1.2
RH 6.2

respectfully,
Joseph