title: The service "security.context_listener.0" has a dependency on a non-existent service "fos_user.user_manager"
body: <p>I have been having this error and I don't know what is wrong with my code. I have checked for various ways to correct it but I can't seem to find.</p>
  
  <p>I keep getting this error:</p>
  
  <blockquote>
    <p>The service "security.context_listener.0" has a dependency on a non-existent service "fos_user.user_manager"</p>
  </blockquote>
  
  <p><strong>This is services.yaml</strong></p>
  
  <pre><code>parameters:
  img_directory: '%kernel.root_dir%/../public/images'
  imports:
      resource: parameters.yml 
  
  locale: en
  
  fos_user:
      db_driver: orm # other valid values are 'mongodb' and 'couchdb'
      firewall_name: main
      user_class: AppBundle\Entity\User
  
      from_email:
          address: "greatblog@gmail.com"
          sender_name: "Great Blog"
  
  knp_paginator:
      page_range: 4                       # number of links showed in the pagination menu (e.g: you have 10 pages, a page_range of 3, on the 5th page you'll see links to page 4, 5, 6)
      default_options:                                 
          page_name: page                 # page query parameter name
          sort_field_name: sort           # sort field query parameter name
          sort_direction_name: direction  # sort direction query parameter name
          distinct: true                  # ensure distinct results, useful when ORM queries are using GROUP BY statements
          filter_field_name: filterField  # filter field query parameter name
          filter_value_name: filterValue  # filter value query paameter name
      template:                                        
          pagination: '@KnpPaginator/Pagination/twitter_bootstrap_v4_pagination.html.twig'     # sliding pagination controls template                                    
          sortable: '@KnpPaginator/Pagination/sortable_link.html.twig' # sort link template                                
          filtration: '@KnpPaginator/Pagination/filtration.html.twig'  # filters template
  
  services:
      # default configuration for services in *this* file
      _defaults:
          autowire: true      # Automatically injects dependencies in your services.
          autoconfigure: true # Automatically registers your services as commands, event subscribers, etc.
          public: false       # Allows optimizing the container by removing unused services; this also means
                              # fetching services directly from the container via $container-&gt;get() won't work.
                              # The best practice is to be explicit about your dependencies anyway.
  # makes classes in src/ available to be used as services
  # this creates a service per class whose id is the fully-qualified class name
  App\:
      resource: '../src/*'
      exclude: '../src/{Entity,Migrations,Tests,Kernel.php}'
  
  # controllers are imported separately to make sure services can be injected
  # as action arguments even if you don't extend any base controller class
  App\Controller\:
      resource: '../src/Controller'
      tags: ['controller.service_arguments']
  </code></pre>
  
  <p><strong>This is security.yaml</strong></p>
  
  <pre><code>security:
  providers:
      fos_user:
          id: fos_user.user_manager
  encoders:
      FOS\UserBundle\Model\UserInterface: bcrypt
      # Symfony\Component\Security\Core\User\User:
      #     algorithm: bcrypt
      #     cost: 12
      # App\Entity\User:
      #     algorithm: bcrypt
      #     cost: 12
  
  role_hierarchy:
      ROLE_ADMIN:       ROLE_USER
      ROLE_SUPER_ADMIN: ROLE_ADMIN
  
  
  firewalls:
      dev:
          pattern: ^/(_(profiler|wdt)|css|images|js)/
          security: false
      main:
          pattern: ^/
          form_login:
              provider: fos_user
              csrf_token_generator: security.csrf.token_manager # Use form.csrf_provider instead for Symfony &lt;2.4
          logout:       true
          anonymous:    true
  
  access_control:
      - { path: ^/login$, role: IS_AUTHENTICATED_ANONYMOUSLY }
      - { path: ^/register, role: IS_AUTHENTICATED_ANONYMOUSLY }
      - { path: ^/resetting, role: IS_AUTHENTICATED_ANONYMOUSLY }
      - { path: ^/admin/, role: ROLE_ADMIN }
  </code></pre>
  
  <p>Please I would need some help to know where exactly the error is coming from.
  Thanks guys.</p>