MODx doesn't see my classes

<?xml version="1.0" encoding="UTF-8"?>

<model package="boxexpert"
       baseClass="xPDOObject"
       platform="mysql"
       defaultEngine="MyISAM"
       phpdoc-package="boxexpert"
       phpdoc-subpackage="model">

    <object class="beCategory" table="category" extends="xPDOObject">
        <field key="id" dbtype="int" precision="11" phptype="integer" null="false" index="pk" generated="native" />
        <field key="name" dbtype="varchar" precision="255" phptype="string" null="false" />
        <index alias="PRIMARY" name="PRIMARY" primary="true" unique="true">
            <column key="id" collation="A" null="false" />
        </index>
        <aggregate alias="All" class="beBox" local="id" foreign="category_id" cardinality="many" owner="local" />
    </object>

    <object class="beBox" table="box" extends="xPDOObject">
        <field key="id" dbtype="int" precision="11" phptype="integer" null="false" index="pk" generated="native" />
        <field key="title" dbtype="varchar" precision="255" phptype="string" null="true" />
        <field key="weight" dbtype="int" precision="2" phptype="integer" null="false" />
        <field key="category_id" dbtype="int" precision="11" phptype="integer" null="false" default="1" />
        <index alias="PRIMARY" name="PRIMARY" primary="true" unique="true">
            <column key="id" collation="A" null="false" />
        </index>
        <aggregate alias="Category" class="beCategory" local="category_id" foreign="id" cardinality="one" owner="foreign" />
    </object>

</model>

<?php
/**
 * Build Schema script
 *
 * @package storefinder
 * @subpackage build
 */
$mtime = microtime();
$mtime = explode(" ", $mtime);
$mtime = $mtime[1] + $mtime[0];
$tstart = $mtime;
set_time_limit(0);
 
define('MODX_BASE_PATH', '/www/test/');
define('MODX_CORE_PATH', MODX_BASE_PATH . 'core/');
define('MODX_MANAGER_PATH', MODX_BASE_PATH . 'manager/');
define('MODX_CONNECTORS_PATH', MODX_BASE_PATH . 'connectors/');
define('MODX_ASSETS_PATH', MODX_BASE_PATH . 'assets/');

include_once MODX_CORE_PATH . 'model/modx/modx.class.php';
$modx= new modX();
$modx->initialize('mgr');
$modx->loadClass('transport.modPackageBuilder','',false, true);
$modx->setLogLevel(modX::LOG_LEVEL_INFO);
$modx->setLogTarget(XPDO_CLI_MODE ? 'ECHO' : 'HTML');
 
$root = MODX_BASE_PATH;
$sources = array(
    'root' => $root,
    'core' => $root.'core/components/boxexpert/',
    'model' => $root.'core/components/boxexpert/model/',
    'assets' => $root.'assets/components/boxexpert/',
    'schema' => $root.'schema/boxexpert/',
);

$manager= $modx->getManager();
$generator= $manager->getGenerator();

$generator->parseSchema($sources['schema'].'schema.xml', $sources['model']);
 
$mtime= microtime();
$mtime= explode(" ", $mtime);
$mtime= $mtime[1] + $mtime[0];
$tend= $mtime;
$totalTime= ($tend - $tstart);
$totalTime= sprintf("%2.4f s", $totalTime);
 
echo "\nExecution time: {$totalTime}\n";
 
exit ();

?>

root@Karachi-Desktop:/www/test/core/components# ls
boxexpert
root@Karachi-Desktop:/www/test/core/components# ls -R
.:
boxexpert

./boxexpert:
model

./boxexpert/model:
boxexpert

./boxexpert/model/boxexpert:
bebox.class.php  becategory.class.php  mysql

./boxexpert/model/boxexpert/mysql:
bebox.class.php    becategory.class.php
bebox.map.inc.php  becategory.map.inc.php

<?php

/**
 * @package boxexpert
 */

$o = '';

$modx->addPackage('boxexpert', '/www/test/core/components/boxexpert/model/');

$box = $modx->getObject('beBox', 1);
$o = $o . $box->get('title');

return $o;