ExceptionNotifier and rake:db:migrate

Question

App and migrations work fine locally but rake db:migrate fails on the server with this error:

undefined method `new' for ExceptionNotifier:Module

The only migration I'm trying to run passed locally and looks like this:

def change
  change_table :users do |t|
    t.remove :admin
  end
  change_column :users, :state, :string, :default => "client"
end

No clue what's causing it. And yeah, I am using the exception notification gem. Any thoughts? Thanks!