Radiant CMS database mailer extension

I am trying to use the Database mailer extension for my Radiant CMS application. I have followed the exact same steps mentioned here. http://blog.aissac.ro/radiant/database-mailer-extension/

When I try to run the rake task to migrate I get this error. I am f开发者_运维知识库ighting with this for a while now. Where and what am I missing?

Radiant version - 0.9

Database - mysql 5.0.75

Rails version - 2.3.5

This is my error log.

http://gist.github.com/524155

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Someone made a fork of this extension and fixed this. I built on their work to fix a few additional bugs: https://github.com/mstalker/radiant-database-mailer-extension