Signing mail with evolution

[Pupeno]

When trying to send GPG signed mail with Evolution I get the following
error:

Could not create message.

Because "gpg: problem with the agent - disabling agent use
gpg: writing to `-'
gpg: DSA/SHA1 signature from: "D3D61A45 Pupeno <pupeno at pupeno.com>"
", you may need to select different mail options.

I installed gnupg-agent, but the problem remains. Any ideas ?
Thanks.
-- 
Pupeno <pupeno at pupeno.com> http://pupeno.com