Controller class Member_password_forgotten.php 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