Notice (8): compact() [<a href='https://secure.php.net/function.compact'>function.compact</a>]: Undefined variable: etagMatches [CORE/src/Http/Response.php, line 1875]
Notice (8): compact() [<a href='https://secure.php.net/function.compact'>function.compact</a>]: Undefined variable: timeMatches [CORE/src/Http/Response.php, line 1875]
Warning (512): Unable to emit headers. Headers sent in file=/home/nbc01/public_html/Hassan/vendor/cakephp/cakephp/src/Error/Debugger.php line=850 [CORE/src/Http/ResponseEmitter.php, line 48]
Warning (2): Cannot modify header information - headers already sent by (output started at /home/nbc01/public_html/Hassan/vendor/cakephp/cakephp/src/Error/Debugger.php:850) [CORE/src/Http/ResponseEmitter.php, line 148]
Warning (2): Cannot modify header information - headers already sent by (output started at /home/nbc01/public_html/Hassan/vendor/cakephp/cakephp/src/Error/Debugger.php:850) [CORE/src/Http/ResponseEmitter.php, line 177]
Warning (2): Cannot modify header information - headers already sent by (output started at /home/nbc01/public_html/Hassan/vendor/cakephp/cakephp/src/Error/Debugger.php:850) [CORE/src/Http/ResponseEmitter.php, line 177]
Error: Missing Method in UsersController

Missing Method in UsersController Cake\Controller\Exception\MissingActionException

Documentation API

The action topics is not defined in UsersController

Error: Create UsersController::topics() in file: src/Controller/UsersController.php.

<?php
namespace App\Controller;

use 
App\Controller\AppController;

class 
UsersController extends AppController
{

    public function 
topics()
    {

    }
}

If you want to customize this error message, create src/Template/Error/missing_action.ctp

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