pg_dump get error

Hi,

    Got the following error when using pg_dump "getTables(): SELECT
(funcname) for trigger returned 0 tuples. Expected 1.

    Having searched the archive and found somebody got similar problem
(http://archives.postgresql.org/pgsql-admin/2001-12/msg00126.php), but
my problem now is that pg_dump doesn't show on which trigger the error
occurs.

    Any hint?

MK Tam