Pg_Dump Strange Error

Hi,

I have a PostgreSQL 6.5.3 database server working flawlessly under
Linux-Mandrake 7.0

However, when I try to use the pg_dump utility, I get this error:

#pg_dump myDatabase > backup.db

NOTICE: get_groname: group 87 not found
getTables(): SELECT failed. Explanation from backend: 'pqReadData() --
backend
closed the channel unexpectedly.
This probably means the backend terminated abnormally
before or while processing the request.

Otherwise, this database has been working perfectly for many weeks (via
ODBC), but pg_dump still refuses to work. I installed from RPMs.

Any ideas?

TIA,

Jorge.

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