ThemeSectionArticleModel not working?

[neckarpixel]

Hey Sven,
this my first attempt to use your extension. I really like the idea of splitting layout articles to a seperate section.

ATM I'm trying add my own logic to the output article, so I use your $GLOBALS['TL_HOOKS']['compileThemeArticle'] Hook.

My files are

src/Ressources/contao/dca/tl_theme_section_article.php

use Contao\CoreBundle\ContaoCoreBundle;
use Contao\CoreBundle\DataContainer\PaletteManipulator;

PaletteManipulator::create()
    ->addField('container','alias',PaletteManipulator::POSITION_AFTER)
    ->applyToPalette('default', 'tl_theme_section_article');

// CONTAINER MODE
$GLOBALS['TL_DCA']['tl_theme_section_article']['fields']['container'] = array(
    'label'         => $GLOBALS['TL_LANG']['tl_theme_section_article']['container'],
    'inputType'     => 'select',
    'options'       => ['container','container-fluid'],
    'reference'     => $GLOBALS['TL_LANG']['tl_theme_section_article']['containerOptions'],
    'eval'          => ['tl_class'=>'w50', 'includeBlankOption' => true],
    'sql'           => ['type' => 'string', 'length' => 50, 'default' => ''],
);

src/Ressources/contao/config/config.php
$GLOBALS['TL_HOOKS']['compileThemeArticle'][] = [ArticleListener::class, 'npGetThemeArticle'];

src/EventListener/ArticleListener.php

namespace Neckarpixel\NparticleBundle\EventListener;
use Contao\CoreBundle\ServiceAnnotation\Hook;

use Contao\ArticleModel;
use Contao\FilesModel;
use Contao\Module;
use Contao\FrontendTemplate;

use Srhinow\ThemeSectionArticleModel;

class ArticleListener
{

    public function npGetThemeArticle(FrontendTemplate $template, array $data, Module $module)
    {

        $objThemeArticle = \ThemeSectionArticleModel::findThemeArticleByIdOrAlias($data->themeArticle);

        $arrCssID = $data->cssID;
        $strClasses = $arrCssID[1];

        // ADD CONTAINER CLASS TO ARTICLE CSS
        $strClasses = $strClasses . ' ' . $objThemeArticle->container;

        $arrCssID[1] = trim($strClasses);
        $data->cssID = $arrCssID;
    }
}

What did I wrong?
This is the log file entry

[2021-05-10 14:29:12] request.CRITICAL: Uncaught PHP Exception Symfony\Component\ErrorHandler\Error\ClassNotFoundError: "Attempted to load class "ThemeSectionArticleModel" from the global namespace. Did you forget a "use" statement for "Srhinow\ThemecontentBundle\Model\ThemeSectionArticleModel"?" at /vendor/neckarpixel/contao-nparticle-bundle/src/EventListener/ArticleListener.php line 60 {"exception":"[object] (Symfony\Component\ErrorHandler\Error\ClassNotFoundError(code: 0): Attempted to load class "ThemeSectionArticleModel" from the global namespace.\nDid you forget a "use" statement for "Srhinow\ThemecontentBundle\Model\ThemeSectionArticleModel"? at ...