cannot find attribute 1 of relation pg_shadow

Hi!

I've got problem with my DB.
When trying to connect to db there is an error, so there is no way to
communicate with this db:

[postgres@czas postgres]$ psql nczas
psql: FATAL 1:  cannot find attribute 1 of relation pg_shadow

pg-shadow looks working properly, I can add users. Second Db in Postgres
is also working without any problem.

postgresql-7.2.4

Any ideas??
I can't find anything related in google and docs.

Thx for any help.

--
Kacper Mikke