help using Encrypt

[Lucélio Gomes de Freitas]

Hello,

Please, anybody helps?   I can't find where I'm making a mistake.

Operating System: Fedora 2.6.33.5-112.fc13.x86_64
Command:
[Lucelio at MAQ02 work]$ gpg --list-keys Lucelio
pub   3072D/77C103F7 2010-06-06
uid                  Lucélio Gomes de Freitas (Par de Chaves definitivas 
em 06/06/2010) <aa.lucelio at gmail.com>

pub   1024D/01150CE3 2010-06-07
uid                  Lucélio (Teste de Chaves) <aa.lucelio at gmail.com>

[Lucelio at MAQ02 work]$ gpg -e -r lucelio ./abcdef
gpg: lucelio: ignorado: Unusable public key
gpg: ./abcdef: encryption failed: Unusable public key

Why?

thanks,
Lucélio.

-- 
Lucélio Gomes de Freitas
ETFCSF->  U.G.F.->  P.U.C.(RJ)
Engº, Analista Suporte(Free Mind).
Email:aa.lucelio at gmail.com
Tel: 55 0XX 21 85964911