trac not working after upgrade to F11

[Martín Marqués]

I upgraded to F11 a few days ago one of my servers and I have problems
with the account module of trac. It give me internal errors when
trying to login:

Trac[main] WARNING: HTTPInternalError: 500 Trac Error (Authentication
information not available. Please refer to the <a
href="/hogar/wiki/TracInstall#ConfiguringAuthentication"
title="Configuring Authentication">installation documentation</a>.)

Trac is running as a mod_python in apache.

I'm also getting in trac.log this:

Trac[env] WARNING: base_url option not set in configuration, generated
links may be incorrect

-- 
Martín Marqués
select 'martin.marques' || '@' || 'gmail.com'
DBA, Programador, Administrador