Fatal error: Uncaught Error: Call to undefined method WP_Textdomain_Registry::reset()
in /home/customer/www/2019.essensciaforsustainability.be/public_html/wp-content/plugins/wpml-string-translation/classes/MO/Hooks/LanguageSwitch.php on line 139

Call stack:

1. WPML\S\M\H\LanguageSwitch::resetTranslationAvailabilityInformation()
   wp-content/plugins/wpml-string-translation/classes/MO/Hooks/LanguageSwitch.php:119
2. WPML\S\M\H\LanguageSwitch::changeMoObjects()
   wp-content/plugins/wpml-string-translation/classes/MO/Hooks/LanguageSwitch.php:73
3. WPML\S\M\H\LanguageSwitch::switchToLocale()
   wp-content/plugins/wpml-string-translation/classes/MO/Hooks/LanguageSwitch.php:48
4. WPML\S\M\H\LanguageSwitch::languageHasSwitched()
   wp-includes/class-wp-hook.php:310
5. WP_Hook::apply_filters()
   wp-includes/class-wp-hook.php:332
6. WP_Hook::do_action()
   wp-includes/plugin.php:517
7. do_action()
   wp-content/plugins/sitepress-multilingual-cms/sitepress.class.php:1181
8. SitePress::switch_lang()
   wp-content/plugins/sitepress-multilingual-cms/sitepress.class.php:2947
9. SitePress::get_ls_languages()
   wp-content/plugins/sitepress-multilingual-cms/classes/seo/class-wpml-seo-headlangs.php:45
10. WPML_SEO_HeadLangs::head_langs()
    wp-includes/class-wp-hook.php:308
11. WP_Hook::apply_filters()
    wp-includes/class-wp-hook.php:332
12. WP_Hook::do_action()
    wp-includes/plugin.php:517
13. do_action()
    wp-includes/general-template.php:3043
14. wp_head()
    wp-content/themes/hello-elementor/header.php:21
15. require_once()
    wp-includes/template.php:783
16. load_template()
    wp-includes/template.php:718
17. locate_template()
    wp-includes/general-template.php:48
18. get_header()
    wp-content/plugins/elementor/modules/page-templates/templates/header-footer.php:9
19. include()
    wp-includes/template-loader.php:106
20. require_once()
    wp-blog-header.php:19
21. require()
    index.php:17