Remove audit gem and audited on user.rb that everything works fine
Started POST "/admin/login" for ::1 at 2017-04-19 18:47:34 -0300
Processing by ActiveAdmin::Devise::SessionsController#create as HTML
Parameters: {"utf8"=>"✓", "authenticity_token"=>"g7f7P3a3RS8hl82MahA32dqXdlCoJjK9TTCWP6DPnjlmYRCUlVPW2fnWicsr8RWeoO7U81/+JdXqM8JLKuNHeg==", "user"=>{"email"=>"[email protected]", "password"=>"[FILTERED]", "remember_me"=>"0"}, "commit"=>"Login"}
User Load (0.7ms) SELECT `users`.* FROM `users` WHERE `users`.`email` = '[email protected]' ORDER BY `users`.`id` ASC LIMIT 1
(0.3ms) BEGIN
SQL (0.6ms) UPDATE `users` SET `current_sign_in_at` = '2017-04-19 21:47:34', `last_sign_in_at` = '2017-04-19 21:47:00', `sign_in_count` = 5, `updated_at` = '2017-04-19 21:47:34' WHERE `users`.`id` = 1
(3.0ms) COMMIT
Can't verify CSRF token authenticity.
Completed 422 Unprocessable Entity in 243ms (ActiveRecord: 4.7ms)
ActionController::InvalidAuthenticityToken (ActionController::InvalidAuthenticityToken):