BUG #1764: newbie

The following bug has been logged online:

Bug reference: 1764
Logged by: john cecilio
Email address: j(dot)diegor(at)gmail(dot)com
PostgreSQL version: 7.4.8
Operating system: CentOS 4.0 (updated to 4.1)
Description: newbie
Details:

Im getting error in pg_user,

"ERROR: Relation 'pg_user' does not exist"

What should I do with this? I think pg_user is not existing on my system.
(just a wild guess). I use the installer include in the CentOS setup and use
the full installation. When Im using the pgAdmin3/phpPgAdmin the error
always shows up but if I use the terminal in accessing postgresql it doesn't
shows up frequently, but Im just a newbie in postgresql. Im not really
familiar in all commands/syntax thats why im trying pgAdmin3/phpPgAdmin.

Is there anything I should setup first to have the 'pg_user'?

Hope you could help me on this. Thank you for your time.