Frontend error after switching to Boilerplate (2023) Theme

[Samuel88]

After switching in Admin Appearance to "Boilerplate (2023)" this php error appear

 Uncaught Error: Class "Timber\ThemeHelper" not found in /mnt/devfiles/Learning/wordpress-boilerplate/www/themes/boilerplate-theme/includes/Site.php:190
Stack trace:
#0 /mnt/devfiles/Learning/wordpress-boilerplate/www/wordpress/wp-includes/class-wp-hook.php(312): App\Theme\Site->filter_style_loader_tag()
#1 /mnt/devfiles/Learning/wordpress-boilerplate/www/wordpress/wp-includes/plugin.php(205): WP_Hook->apply_filters()
#2 /mnt/devfiles/Learning/wordpress-boilerplate/www/wordpress/wp-includes/class-wp-styles.php(251): apply_filters()
#3 /mnt/devfiles/Learning/wordpress-boilerplate/www/wordpress/wp-includes/class-wp-dependencies.php(137): WP_Styles->do_item()
#4 /mnt/devfiles/Learning/wordpress-boilerplate/www/wordpress/wp-includes/functions.wp-styles.php(68): WP_Dependencies->do_items()
#5 /mnt/devfiles/Learning/wordpress-boilerplate/www/wordpress/wp-includes/class-wp-hook.php(310): wp_print_styles()
#6 /mnt/devfiles/Learning/wordpress-boilerplate/www/wordpress/wp-includes/class-wp-hook.php(334): WP_Hook->apply_filters()
#7 /mnt/devfiles/Learning/wordpress-boilerplate/www/wordpress/wp-includes/plugin.php(517): WP_Hook->do_action()
#8 /mnt/devfiles/Learning/wordpress-boilerplate/www/wordpress/wp-includes/general-template.php(3053): do_action()
#9 /mnt/devfiles/Learning/wordpress-boilerplate/vendor/timber/timber/src/Twig.php(602): wp_head()
#10 /mnt/devfiles/Learning/wordpress-boilerplate/vendor/twig/twig/src/Environment.php(361) : eval()'d code(54): Timber\Twig->exec_function()
#11 /mnt/devfiles/Learning/wordpress-boilerplate/vendor/twig/twig/src/Template.php(394): __TwigTemplate_78d0080dadbe1d294a38c731f36ebfc6->doDisplay()
#12 /mnt/devfiles/Learning/wordpress-boilerplate/vendor/twig/twig/src/Template.php(367): Twig\Template->displayWithErrorHandling()
#13 /mnt/devfiles/Learning/wordpress-boilerplate/vendor/twig/twig/src/Environment.php(361) : eval()'d code(89): Twig\Template->display()
#14 /mnt/devfiles/Learning/wordpress-boilerplate/vendor/twig/twig/src/Template.php(171): __TwigTemplate_456fa9bada69fd758611c5c54582fe2c->block_html_head_container()
#15 /mnt/devfiles/Learning/wordpress-boilerplate/vendor/twig/twig/src/Environment.php(361) : eval()'d code(43): Twig\Template->displayBlock()
#16 /mnt/devfiles/Learning/wordpress-boilerplate/vendor/twig/twig/src/Template.php(394): __TwigTemplate_456fa9bada69fd758611c5c54582fe2c->doDisplay()
#17 /mnt/devfiles/Learning/wordpress-boilerplate/vendor/twig/twig/src/Template.php(367): Twig\Template->displayWithErrorHandling()
#18 /mnt/devfiles/Learning/wordpress-boilerplate/vendor/twig/twig/src/Environment.php(361) : eval()'d code(42): Twig\Template->display()
#19 /mnt/devfiles/Learning/wordpress-boilerplate/vendor/twig/twig/src/Template.php(394): __TwigTemplate_c55be16c1da515c5bdad4c1ef29510f9->doDisplay()
#20 /mnt/devfiles/Learning/wordpress-boilerplate/vendor/twig/twig/src/Template.php(367): Twig\Template->displayWithErrorHandling()
#21 /mnt/devfiles/Learning/wordpress-boilerplate/vendor/twig/twig/src/Template.php(379): Twig\Template->display()
#22 /mnt/devfiles/Learning/wordpress-boilerplate/vendor/twig/twig/src/TemplateWrapper.php(40): Twig\Template->render()
#23 /mnt/devfiles/Learning/wordpress-boilerplate/vendor/timber/timber/src/Loader.php(178): Twig\TemplateWrapper->render()
#24 /mnt/devfiles/Learning/wordpress-boilerplate/vendor/timber/timber/src/Timber.php(1475): Timber\Loader->render()
#25 /mnt/devfiles/Learning/wordpress-boilerplate/vendor/timber/timber/src/Timber.php(1612): Timber\Timber::compile()
#26 /mnt/devfiles/Learning/wordpress-boilerplate/www/themes/boilerplate-theme/theme/front-page.php(14): Timber\Timber::render()
#27 /mnt/devfiles/Learning/wordpress-boilerplate/www/wordpress/wp-includes/template-loader.php(106): include('...')
#28 /mnt/devfiles/Learning/wordpress-boilerplate/www/wordpress/wp-blog-header.php(19): require_once('...')
#29 /mnt/devfiles/Learning/wordpress-boilerplate/www/index.php(18): require('...')
#30 {main}
  thrown in /mnt/devfiles/Learning/wordpress-boilerplate/www/themes/boilerplate-theme/includes/Site.php on line 190

I look for this class Timber\ThemeHelper in vendor directory, but I didn't found anything