Porque o autoload não funciona quando tem um namespace no script?

class AutoLoad {

 private $archives;

 public function __construct(){
 spl_autoload_register([$this, 'folders']);
 }

 private function folders($files){
 $this->archives = ['_models/'.$files.'.class.php','controllers/'.$files.'.php'];

 foreach ($this->archives as $archive):
 if(file_exists($archive)):

 require_once $archive;

 endif;
 endforeach;
 }

}

	 

	 

	Está incluindo todas as classes exceto essa:

	 

<?php

namespace Biblioteca;

 use PDO;
 use Exception;
 use PDOException;

class CRUD extends Conn{

 public function __construct(){
 parent::__construct('mysql:dbname=banco; host=localhost', 'root', '',
 array(PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES \'UTF8\''));

 if (is_object(parent::con())):
 parent::con()->exec($value);
 else:
 die(parent::kill_with_style());
 endif;

 }