title: Devise NoMethodError 'for' ParameterSanitizer
body: <p>I'm going nuts with an error I'm getting every time I try to sing in/sing up on my web.</p>
  
  <p>Heroku logs:</p>
  
  <pre><code>Started GET "/users/sign_in" for 201.235.89.150 at 2016-07-06 01:35:03 +0000
   Completed 500 Internal Server Error in 3ms (ActiveRecord: 0.0ms)
  NoMethodError (undefined method `for' for #&lt;Devise::ParameterSanitizer:0x007f5968e0a920&gt;):
   app/controllers/application_controller.rb:11:in `configure_permitted_parameters'
  </code></pre>
  
  <p>application_controller.rb</p>
  
  <pre><code>class ApplicationController &lt; ActionController::Base
    # Prevent CSRF attacks by raising an exception.
    # For APIs, you may want to use :null_session instead.
    protect_from_forgery with: :exception
  
    before_filter :configure_permitted_parameters, if: :devise_controller?
  
      protected
  
          def configure_permitted_parameters
              devise_parameter_sanitizer.for(:sign_up) { |u| u.permit(:username, :email, :password, :provider, :uid) }
              devise_parameter_sanitizer.for(:account_update) { |u| u.permit(:username, :email, :password, :current_password) }
          end
  end
  </code></pre>
  
  <p>The thing is it is working fine locally. It´s just on Heroku. And also it was working just fine a couple of days ago.</p>