rake db: миграция рейка прервана! NoMethodEr

Question

Когда я пытаюсь запустить rake db: migrate Я получаю следующую ошибку:

DEPRECATION WARNING: The factory_girl gem is deprecated. Please upgrade to factory_bot. See https://github.com/thoughtbot/factory_bot/blob/v4.9.0/UPGRADE_FROM_FACTORY_GIRL.md for further instructions. (called from <top (required)> at /var/www/html/sophy_web/config/application.rb:14)
/root/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/actionpack-4.2.8/lib/action_dispatch/http/mime_type.rb:163: warning: already initialized constant Mime::PDF
/root/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/actionpack-4.2.8/lib/action_dispatch/http/mime_type.rb:163: warning: previous definition of PDF was here
rake aborted!
NoMethodError: undefined method `>' for nil:NilClass
/var/www/html/application/config/initializers/rollbar.rb:2:in `<top (required)>'
/var/www/html/application/config/environment.rb:5:in `<top (required)>'
Tasks: TOP => db:migrate => environment
(See full trace by running task with --trace)

Я использую ruby ​​версии 2.5.1 и rails 4.2.8.

Код моего rollbar.rb:

require 'rollbar/rails'
Rollbar.configure do |config|      
  config.access_token = '9234902384023843203fsd23'

  # Here we'll disable in 'test':
  if Rails.env.test?
    config.enabled = false
  end
end

Код моего окружения. Rb

# Load the Rails application.
require File.expand_path('../application', __FILE__)

# Initialize the Rails application.
Rails.application.initialize!