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I am trying to implement the solution given in this question.

I want to have custom templates for 4xx pages.

I am using Drupal 8.3.1

I have tried the code as given in the above link to create the page suggestions in my theme's .theme file:

/** * Implements hook_theme_suggestions_page() to set 40x template suggestions */ function MY_THEME_NAME_theme_suggestions_page(array $variables) { $path_args = explode('/', trim(\Drupal::service('path.current')->getPath(), '/')); $suggestions = theme_get_suggestions($path_args, 'page'); $http_error_suggestions = [ 'system.401' => 'page__401', 'system.403' => 'page__403', 'system.404' => 'page__404', ]; $route_name = \Drupal::routeMatch()->getRouteName(); if (isset($http_error_suggestions[$route_name])) { $suggestions[] = $http_error_suggestions[$route_name]; } return $suggestions; }

It does not appear to work.

page--404.html.twig or page--system--404.html.twig are not being used.

404 and 403 pages are not set inside the admin of the page.

What else am I suppose to do to get this working?

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  • I am getting ready to do something similar and was researching this, and I see folks using HOOK_theme_suggestions_HOOK_alter() api.drupal.org/api/drupal/… so, I wonder if you just need to add _alter to your function name. Also, it's always worth mentioning, did you 'clear all caches' under admin->config->devel->performance? Commented Jun 7, 2017 at 16:42
  • Sure have, many times. No luck. Commented Jun 8, 2017 at 5:09

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I have pretty much the same code as you have with the exception that I have a hook_theme_suggestions_page_alter(). With the _alter attached to it.

Try putting the HOOK in a custom module instead of the .theme file.

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