Notice (1024): Undefined property: ErrorController::$ModelSearch in /home/www/admin_panacamara/v4.2-1.0/src/Controller/AppController.php on line 104 [CORE/src/Controller/Controller.php, line 321]
Warning (512): Unable to emit headers. Headers sent in file=/home/www/admin_panacamara/v4.2-1.0/vendor/cakephp/cakephp/src/Error/Debugger.php line=970 [CORE/src/Http/ResponseEmitter.php, line 71]
Warning (2): Cannot modify header information - headers already sent by (output started at /home/www/admin_panacamara/v4.2-1.0/vendor/cakephp/cakephp/src/Error/Debugger.php:970) [CORE/src/Http/ResponseEmitter.php, line 168]
Warning (2): Cannot modify header information - headers already sent by (output started at /home/www/admin_panacamara/v4.2-1.0/vendor/cakephp/cakephp/src/Error/Debugger.php:970) [CORE/src/Http/ResponseEmitter.php, line 197]
Error: Missing Controller

Missing Controller 📋

Cake\Http\Exception\MissingControllerException
Toggle Vendor Stack Frames

Error Theme.AssetsController could not be found.

     * @return \Cake\Http\Exception\MissingControllerException
     */
    protected function missingController(ServerRequest $request)
    {
        return 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 AssetsController below in file: /home/www/admin_panacamara/v4.2-1.0/plugins/Theme/src/Controller/AssetsController.php

    <?php
    
namespace Theme\Controller;

    use 
Theme\Controller\AppController;

    class 
AssetsController extends AppController
    
{

    }

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