We took this offline, but to update the list- "I know I've seen this before- found the thread: http://old.nabble.com/Installin-on-HostingRails-td28031362.html
As Jim said, looks like you have a mixed setup, a .9 DB and a .8 gem. You can tell Heroku what gem you want, by setting up a .gems file and telling it which radiant."
