rails 5 NoMethodError in RegistrationsController#new undefined method

Question

Working on a course project and using rails 5 however the course isn't using rails 5 receiving this error after implementing this in NoMethodError in RegistrationsController#new undefined method `<<' for nil:NilClass

was this before: class ApplicationController < ActionController::Base

  class RegistrationsController < ApplicationController

  before_action :configure_permitted_paramters, if: :devise_controller?

  protected
    def configure_permitted_paramters
        devise_parameter_sanitizer.permit(:sign_up) << :fullname
        devise_parameter_sanitizer.permit(:account_update) << :fullname << :cell_number << :license_plate_number << :vehicle_description << :email << :password
       end
   end

My routes changed to this as well part of the problem?

Rails.application.routes.draw do

  root 'pages#home'

  devise_for :users, 
    path => '', 
    :path_names => {:sign_in => 'login', :sign_out => 'logout', :edit => 'profile'},
controllers => {:omniauth_callbacks => 'omniauth_callbacks',
    :registrations => 'registrations'
                                                        }

  resources :users, only: [:show]

end

Answer 1

Your registration controller is redefining the Application Controller rather than defining the registration controller. Try the following:

class RegistrationsController < ApplicationController
  def new
  end
end