Fatal error: Uncaught TypeError: Argument 1 passed to WP_Translation_Controller::set_locale() must be of the type string, null given, called in /home/customer/www/fonderiamapelli.it/public_html/fonderiamapelli/wp-includes/l10n.php on line 799 and defined in /home/customer/www/fonderiamapelli.it/public_html/fonderiamapelli/wp-includes/l10n/class-wp-translation-controller.php:87 Stack trace: #0 /home/customer/www/fonderiamapelli.it/public_html/fonderiamapelli/wp-includes/l10n.php(799): WP_Translation_Controller->set_locale(NULL) #1 /home/customer/www/fonderiamapelli.it/public_html/fonderiamapelli/wp-includes/l10n.php(1005): load_textdomain('foogallery', '/home/customer/...', NULL) #2 /home/customer/www/fonderiamapelli.it/public_html/fonderiamapelli/wp-content/plugins/foogallery/includes/foopluginbase/classes/class-foo-plugin-textdomain.php(51): load_plugin_textdomain('foogallery', false, 'foogallery/lang...') #3 /home/customer/www/fonderiamapelli.it/public_html/fonderiamapelli/wp-content/plugins/foogallery/includes/fooplugi in /home/customer/www/fonderiamapelli.it/public_html/fonderiamapelli/wp-includes/l10n/class-wp-translation-controller.php on line 87