Warning (512) : Support for loading components using $components property is removed. Use $this->loadComponent() instead in initialize(). - [internal], line: ?? [in /var/www/plrt/vendor/cakephp/cakephp/src/Core/functions.php, line 268]
Warning (512) : Unable to emit headers. Headers sent in file=/var/www/plrt/vendor/cakephp/cakephp/src/Error/Renderer/HtmlErrorRenderer.php line=36 [in /var/www/plrt/vendor/cakephp/cakephp/src/Http/ResponseEmitter.php, line 71]
Warning (2) : Cannot modify header information - headers already sent by (output started at /var/www/plrt/vendor/cakephp/cakephp/src/Error/Renderer/HtmlErrorRenderer.php:36) [in /var/www/plrt/vendor/cakephp/cakephp/src/Http/ResponseEmitter.php, line 168]
Warning (2) : Cannot modify header information - headers already sent by (output started at /var/www/plrt/vendor/cakephp/cakephp/src/Error/Renderer/HtmlErrorRenderer.php:36) [in /var/www/plrt/vendor/cakephp/cakephp/src/Http/ResponseEmitter.php, line 197]
Warning (2) : Cannot modify header information - headers already sent by (output started at /var/www/plrt/vendor/cakephp/cakephp/src/Error/Renderer/HtmlErrorRenderer.php:36) [in /var/www/plrt/vendor/cakephp/cakephp/src/Http/ResponseEmitter.php, line 197]
Error: Missing Method in AnnouncementsController

Missing Method in AnnouncementsController 📋

Cake\Controller\Exception\MissingActionException
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Error The action alertListFound is not defined in AnnouncementsController

        if ($result instanceof ResponseInterface) {
            return $result;
        }
        $action $controller->getAction();
        $args $this->getActionArgs(
            $action,
            array_values((array)$controller->getRequest()->getParam('pass'))
        );

Error Create AnnouncementsController::alertListFound() in file: src/Controller/AnnouncementsController.php.

<?php
namespace App\Controller;

use 
App\Controller\AppController;

class 
AnnouncementsController extends AppController
{

    public function 
alertListFound()
    {

    }
}

If you want to customize this error message, create templates/Error/missing_action.php