Warning (2): Declaration of App\Controller\ErrorController::beforeFilter(App\Controller\Event $event) should be compatible with Cake\Controller\Controller::beforeFilter(Cake\Event\EventInterface $event) [APP/Controller/ErrorController.php, line 28]
Warning (512): Unable to emit headers. Headers sent in file=/home/educaananindeua/public_html/vendor/cakephp/cakephp/src/Error/Debugger.php line=830 [CORE/src/Http/ResponseEmitter.php, line 71]
Warning (2): Cannot modify header information - headers already sent by (output started at /home/educaananindeua/public_html/vendor/cakephp/cakephp/src/Error/Debugger.php:830) [CORE/src/Http/ResponseEmitter.php, line 168]
Warning (2): Cannot modify header information - headers already sent by (output started at /home/educaananindeua/public_html/vendor/cakephp/cakephp/src/Error/Debugger.php:830) [CORE/src/Http/ResponseEmitter.php, line 197]
Error: Missing Controller

Missing Controller 📋

Cake\Http\Exception\MissingControllerException
Toggle Vendor Stack Frames

Error 'Controller could not be found.

/home/educaananindeua/public_html/vendor/cakephp/cakephp/src/Controller/ControllerFactory.php Toggle Arguments
     * @return void
     */
    protected function missingController(ServerRequest $request): void
    {
        throw new MissingControllerException([
            'class' => $request->getParam('controller'),
            'plugin' => $request->getParam('plugin'),
            'prefix' => $request->getParam('prefix'),
            '_ext' => $request->getParam('_ext'),

In the case you tried to access a plugin controller make sure you added it to your composer file or you use the autoload option for the plugin.

Suggestion Create the class 'Controller below in file: src/Controller/'Controller.php

    <?php
    namespace App\Controller;

    use App\Controller\AppController;

    class 'Controller extends AppController
    {

    }

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