deploying devise/omniauth on heroku
===

When running:

    heroku run rake db:migrate

I am returned the error:

    Running `rake db:migrate` attached to terminal... up, run.1
    rake aborted!
    no such file to load -- devise

This is the error I see with a "require 'devise'" line in the top of my application.rb file. Previously (without this line), I was being returned a different error when running heroku run rake db:migrate saying "uninitialized constant Devise".

My app is working fine locally. I can't seem to find anyone else with the same problem, so any leads would be appreciated!