Did you use script/generate migration? Migrations need to be under db/migrate.
Jason
that migration is perfectly fine, I gather it's been made my acts_as_attachment or attachment_foo plugin??? Anyhow, I have the exact same migration(without the "texto" column and it runs no problems, so it might be a different problem.
Is your database.yml connected? When you start the sever and go to the index page, does rails have the db adapter field filled in? Sounds to me like it can't connect to the db.