Notice (1024) : Undefined property: ErrorController::$Auth in /home/practiceflowflex/public_html/src/Controller/AppController.php on line 101 [in /home/practiceflowflex/public_html/vendor/cakephp/cakephp/src/Controller/Controller.php, line 330]
Warning (512) : Unable to emit headers. Headers sent in file=/home/practiceflowflex/public_html/vendor/cakephp/cakephp/src/Error/Renderer/HtmlErrorRenderer.php line=36 [in /home/practiceflowflex/public_html/vendor/cakephp/cakephp/src/Http/ResponseEmitter.php, line 71]
Error: Controller class Sitemap.xml could not be found.

Controller class Sitemap.xml could not be found. 📋

Cake\Http\Exception\MissingControllerException
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            strpos($controller'/') !== false ||
            strpos($controller'.') !== false ||
            $firstChar === strtolower($firstChar)
        ) {
            throw $this->missingController($request);
        }
        /** @var class-string<\Cake\Controller\Controller>|null */
        return App::className($pluginPath $controller$namespace'Controller');

If you want to customize this error message, create templates/Error/error500.php