Undefined array key “elType”

Hi, I have created this test site [ redundant link removed ] and it’s all ok.

If I duplicate the website (link of duplicated site -> /) receive this error. Why?

Warning: Undefined array key "elType" in /var/www/html/negozioperfetto.com/wp-content/plugins/elementor/includes/managers/elements.php on line 72

Warning: Undefined array key "elType" in /var/www/html/negozioperfetto.com/wp-content/plugins/elementor/includes/managers/elements.php on line 75

Fatal error: Uncaught Error: Call to a member function get_default_args() on array in /var/www/html/negozioperfetto.com/wp-content/plugins/elementor/includes/managers/elements.php:83 Stack trace: #0 /var/www/html/negozioperfetto.com/wp-content/plugins/elementor/core/files/css/post.php(172): Elementor\Elements_Manager->create_element_instance() #1 /var/www/html/negozioperfetto.com/wp-content/plugins/elementor/core/files/css/base.php(632): Elementor\Core\Files\CSS\Post->render_css() #2 /var/www/html/negozioperfetto.com/wp-content/plugins/elementor/core/files/base.php(180): Elementor\Core\Files\CSS\Base->parse_content() #3 /var/www/html/negozioperfetto.com/wp-content/plugins/elementor/core/files/css/base.php(131): Elementor\Core\Files\Base->update_file() #4 /var/www/html/negozioperfetto.com/wp-content/plugins/elementor/core/files/css/base.php(218): Elementor\Core\Files\CSS\Base->update() #5 /var/www/html/negozioperfetto.com/wp-content/plugins/elementor/core/files/css/post.php(201): Elementor\Core\Files\CSS\Base->enqueue() #6 /var/www/html/negozioperfetto.com/wp-content/plugins/elementor/includes/frontend.php(639): Elementor\Core\Files\CSS\Post->enqueue() #7 /var/www/html/negozioperfetto.com/wp-includes/class-wp-hook.php(307): Elementor\Frontend->enqueue_styles() #8 /var/www/html/negozioperfetto.com/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters() #9 /var/www/html/negozioperfetto.com/wp-includes/plugin.php(474): WP_Hook->do_action() #10 /var/www/html/negozioperfetto.com/wp-includes/script-loader.php(2105): do_action() #11 /var/www/html/negozioperfetto.com/wp-includes/class-wp-hook.php(307): wp_enqueue_scripts() #12 /var/www/html/negozioperfetto.com/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters() #13 /var/www/html/negozioperfetto.com/wp-includes/plugin.php(474): WP_Hook->do_action() #14 /var/www/html/negozioperfetto.com/wp-includes/general-template.php(3042): do_action() #15 /var/www/html/negozioperfetto.com/wp-content/themes/porto/head.php(67): wp_head() #16 /var/www/html/negozioperfetto.com/wp-includes/template.php(772): require('...') #17 /var/www/html/negozioperfetto.com/wp-includes/template.php(716): load_template() #18 /var/www/html/negozioperfetto.com/wp-includes/general-template.php(204): locate_template() #19 /var/www/html/negozioperfetto.com/wp-content/themes/porto/header.php(10): get_template_part() #20 /var/www/html/negozioperfetto.com/wp-includes/template.php(770): require_once('...') #21 /var/www/html/negozioperfetto.com/wp-includes/template.php(716): load_template() #22 /var/www/html/negozioperfetto.com/wp-includes/general-template.php(48): locate_template() #23 /var/www/html/negozioperfetto.com/wp-content/themes/porto/page.php(1): get_header() #24 /var/www/html/negozioperfetto.com/wp-includes/template-loader.php(106): include('...') #25 /var/www/html/negozioperfetto.com/wp-blog-header.php(19): require_once('...') #26 /var/www/html/negozioperfetto.com/index.php(17): require('...') #27 {main} thrown in /var/www/html/negozioperfetto.com/wp-content/plugins/elementor/includes/managers/elements.php on line 83

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