"Cache lookup failed for relation 16905" ??

Hello all,

I got a weird behavior testing PostgreSQL 7.3b3. The query below was
run in a FreeBSD 4.4 system, on a fresh install and just I just had
made an initb. No classes created at all.

howe=# select p.oid, n.nspname, pg_get_userbyid(p.proowner), proname
from pg_proc as p, pg_namespace as n where pg_table_is_visible(p.oid);
ERROR:  Cache lookup failed for relation 16905
ERROR:  Cache lookup failed for relation 16905  

What does that message mean ? there is not even such a relation in
pg_class.

Thanks.
-- 
Best regards,Steve Howe                          mailto:howe@carcass.dhs.org