I have created custom module named hello my files are

hello.info.yml is

name: Hello 
type: module 
description: 'My first Drupal 8 module.' 
package: Awesome modules 
version: 1.0 
core: '8.x' 

hello.module file is


use Drupal\Core\Routing\RouteMatchInterface; 
function hello_hello_world() {    

    return t('Hello Drupal 8 World!'); 


** hello.routing.yml** file is

  path: '/hello'   
       _controller: '\Drupal\hello\Controller\HelloController::sayhello'   
    _permission: 'access content'

and last one is HelloController.php is under hello/src/Controller folder


namespace Drupal\hello\Controller;
use Drupal\Core\Controller\ControllerBase;

class HelloController extends ControllerBase {
     * [sayhello description]
     * @return [type] [description]
    public function sayhello() {
        return array('#markup' => hello_hello_world());

when we browse this page mywebsite.com/hello it gives a 404 error page.

Note: module is successfully enabled from admin

  • 1
    I think _permission: 'TRUE' is not a valid thing. You need to use a permission name, such as _permission: 'access content'
    – No Sssweat
    May 7, 2016 at 10:50
  • no its still 404 May 7, 2016 at 10:55
  • Is help.routing.yml the name of the routing file of yours? It should be hello.routing.yml May 7, 2016 at 10:59

2 Answers 2


The indentation of your hello.routing.yml file is wrong. It should be as the following one. (See user.routing.yml.)

  path: '/user/password'
    _form: '\Drupal\user\Form\UserPasswordForm'
    _title: 'Reset your password'
    _access: 'TRUE'
    _maintenance_access: TRUE

Indentation in YAML files is very important, since it changes the file content.

Notice that you can use _access: 'TRUE', when the page doesn't require a specific permission. The _maintenance_access: TRUE line is not necessary. If you use it, users have access to your route even when the site is in maintenance mode; other requirements are still respected, so you could have something similar to the following.

  path: '/user/login'
    _form: '\Drupal\user\Form\UserLoginForm'
    _title: 'Log in'
    _user_is_logged_in: 'FALSE'
    _maintenance_access: TRUE

Before making any changes, uninstall the module, fix the file, and re-install the module.

As side note, you don't need the use Drupal\Core\Routing\RouteMatchInterface; line in your hello.module file, since you aren't using that PHP interface.


Couple of things which is wrong in the above code:

  • help.routing.yml should be renamed to hello.routing.yml
  • Controller folder should be under src folder. Structure should be hello/src/Controller/HelloController.php.

Hope that making these changes help you to render the page without 404 error.


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