PHP 8 Broke site

Hi, I’ve installed PHP 8.3 and site had fatal error, then I try PHP 8.0 (that should be supported) and again I got this:

[28-Sep-2024 10:49:54 UTC] PHP Fatal error:  Uncaught Error: Class "DOMDocument" not found in /var/www/salotto/wp-content/plugins/armember/core/classes/class.arm_modal_view_in_menu.php:544
Stack trace:
#0 /var/www/salotto/wp-includes/class-wp-hook.php(324): ARM_modal_view_in_menu->arm_wp_loaded_walker_menu()
#1 /var/www/salotto/wp-includes/plugin.php(205): WP_Hook->apply_filters()
#2 /var/www/salotto/wp-includes/nav-menu-template.php(302): apply_filters()
#3 /var/www/salotto/wp-content/plugins/elementor-pro/modules/nav-menu/widgets/nav-menu.php(1475): wp_nav_menu()
#4 /var/www/salotto/wp-content/plugins/elementor/includes/base/controls-stack.php(2325): ElementorPro\Modules\NavMenu\Widgets\Nav_Menu->render()
#5 /var/www/salotto/wp-content/plugins/elementor/includes/base/widget-base.php(635): Elementor\Controls_Stack->render_by_mode()
#6 /var/www/salotto/wp-content/plugins/elementor/includes/base/widget-base.php(776): Elementor\Widget_Base->render_content()
#7 /var/www/salotto/wp-content/plugins/elementor/includes/base/element-base.php(483): Elementor\Widget_Base->print_content()
#8 /var/www/salotto/wp-content/plugins/elementor/includes/base/element-base.php(1442): Elementor\Element_Base->print_element()
#9 /var/www/salotto/wp-content/plugins/elementor/includes/base/element-base.php(483): Elementor\Element_Base->print_content()
#10 /var/www/salotto/wp-content/plugins/elementor/includes/base/element-base.php(1442): Elementor\Element_Base->print_element()
#11 /var/www/salotto/wp-content/plugins/elementor/includes/base/element-base.php(483): Elementor\Element_Base->print_content()
#12 /var/www/salotto/wp-content/plugins/elementor/core/base/document.php(1875): Elementor\Element_Base->print_element()
#13 /var/www/salotto/wp-content/plugins/elementor/core/base/document.php(1800): Elementor\Core\Base\Document->do_print_elements()
#14 /var/www/salotto/wp-content/plugins/elementor-pro/modules/theme-builder/documents/theme-document.php(412): Elementor\Core\Base\Document->print_elements()
#15 /var/www/salotto/wp-content/plugins/elementor/includes/frontend.php(1200): ElementorPro\Modules\ThemeBuilder\Documents\Theme_Document->print_elements_with_wrapper()
#16 /var/www/salotto/wp-content/plugins/elementor/core/base/document.php(1249): Elementor\Frontend->get_builder_content()
#17 /var/www/salotto/wp-content/plugins/elementor/modules/library/documents/library-document.php(76): Elementor\Core\Base\Document->get_content()
#18 /var/www/salotto/wp-content/plugins/elementor-pro/modules/theme-builder/documents/theme-document.php(158): Elementor\Modules\Library\Documents\Library_Document->get_content()
#19 /var/www/salotto/wp-content/plugins/elementor-pro/modules/theme-builder/documents/theme-document.php(173): ElementorPro\Modules\ThemeBuilder\Documents\Theme_Document->get_content()
#20 /var/www/salotto/wp-content/plugins/elementor-pro/modules/theme-builder/classes/locations-manager.php(370): ElementorPro\Modules\ThemeBuilder\Documents\Theme_Document->print_content()
#21 /var/www/salotto/wp-content/plugins/elementor-pro/modules/theme-builder/api.php(13): ElementorPro\Modules\ThemeBuilder\Classes\Locations_Manager->do_location()
#22 /var/www/salotto/wp-content/themes/hello-elementor/header.php(35): elementor_theme_do_location()
#23 /var/www/salotto/wp-includes/template.php(810): require_once('...')
#24 /var/www/salotto/wp-includes/template.php(745): load_template()
#25 /var/www/salotto/wp-includes/general-template.php(48): locate_template()
#26 /var/www/salotto/wp-content/plugins/elementor/modules/page-templates/templates/header-footer.php(9): get_header()
#27 /var/www/salotto/wp-includes/template-loader.php(106): include('...')
#28 /var/www/salotto/wp-blog-header.php(19): require_once('...')
#29 /var/www/salotto/index.php(17): require('...')
#30 {main}
  thrown in /var/www/salotto/wp-content/plugins/armember/core/classes/class.arm_modal_view_in_menu.php on line 544

Any hint ?