Error trying to restore db with blobs

Hi everyone,

This is the command for dump I´m using:
pg_dump -Ft -b -o $DB | bzip2 > $ARQ

This is the command for restore:
pg_restore -h $SRV -vOd $DB -u $BUNZIPARQ

This error occurs both in 7.12 and 7.13 I didn´t tested in 7.2

I´m getting this error:

Archiver: ******** WARNING ********
Data restoration may fail since any defined triggers
can not be disabled (no superuser username specified).
This is only a problem for restoration into a database
with triggers already defined.

Creating <Init> Max OID
Archiver(db): Could not execute query. No result from backend.

any hint??
Thanks!

Atenciosamente,
Evandro Júnior
Analista de Sistemas
Desenvolvedor Web
http://www.horizontenet.com.br