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.

This database has been working perfectly for many weeks, but pg_dump
refuses to work.

Any ideas?

Best Regards,

Jorge.

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