Possible source of error

There seems to be a problem with one of my databases... Here's an error:

bash-2.05a$ pg_dump activa > activa.psql
pg_dump: [archiver (db)] connection to database "activa" failed: FATAL:
cannot open segment 1 of relation pg_class_relname_nsp_index (target block
589840): No such file or directory

Any ideas what would cause this?

Garo.

=-=-==-=-=-==

Xapnet Internet Solutions
1501 Powell St., Suite N
Emeryville, CA 94608

Tel - (510) 655-9771
Fax - (510) 655-9775
Web - http://www.xapnet.com