iknuiman

I have a GT3 theme and Elementor version 3.7.7. I can’t update the page after editing the content. I deactivated all plugins, no success. Even just activating Elementor and theme does not resolve the problem. Log results:
PHP Fatal error: Uncaught Error: Class ‘Elementor\\Scheme_Color’ not found in /home/public/sites/www.berentschotvitaal.nl/wp-content/plugins/gt3-themes-core/core/theme-adding-functions.php:1119
Stack trace:
#0 /home/public/sites/www.berentschotvitaal.nl/wp-includes/class-wp-hook.php(307): GT3_Core_Elementor->{closure}()
#1 /home/public/sites/www.berentschotvitaal.nl/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters()
#2 /home/public/sites/www.berentschotvitaal.nl/wp-includes/plugin.php(476): WP_Hook->do_action()
#3 /home/public/sites/www.berentschotvitaal.nl/wp-content/plugins/elementor/includes/base/controls-stack.php(1593): do_action()
#4 /home/public/sites/www.berentschotvitaal.nl/wp-content/plugins/elementor/includes/widgets/toggle.php(236): Elementor\\Controls_Stack->end_controls_section()
#5 /home/public/sites/www.berentschotvitaal.nl/wp-content/plugins/elementor/includes/base/controls-stack.php(2310): Elementor\\Widget_Toggle->register_controls()
#6 /home/public/sites/www.berentschotvitaal.nl/wp-content/plugins/e in /home/public/sites/www.berentschotvitaal.nl/wp-content/plugins/gt3-themes-core/core/theme-adding-functions.php on line 1119`

Should I downgrade and if yes to what version?