common_fields: permission denied (more)

Just to add more info I made a "pg_dumpall | grep user1" to be sure that the
user was really created, which sounds to be the case :

CREATE USER user1 WITH SYSID 100 NOCREATEDB NOCREATEUSER;

> Hi there,
>
> I have a problem accessing my postgres database when using a
> specific user...
>
> If I run and pg_dumpall using the postgres linux user I have
> no problem. Then I tried to add a new user only for one
> database (let say "user1" and "db1"). My pg_hba.conf looks like :
>
> local all all trust
> host all all 127.0.0.1 255.255.255.255 trust
> host all all 0.0.0.0 255.255.255.255 reject
>
> When I try to run "./pg_dump --username=user1 --password db1"
> I have an error saying :
>
> pg_dump: Attempt to lock table "common_fields" failed.
> ERROR: common_fields: permission denied
>
>
> Any idea ?
>
> Thanks
>
> Oliver
>