Fatal error: Cannot declare class WP_Metadata_Lazyloader, because the name is already in use in /home/cleod16a/public_html/wp-includes/class-wp-metadata-lazyloader.php on line 31

Fatal error: Uncaught Error: Class 'WP_Translation_Controller' not found in /home/cleod16a/public_html/wp-includes/l10n.php:800 Stack trace: #0 /home/cleod16a/public_html/wp-includes/l10n.php(959): load_textdomain('default', '/home/cleod16a/...', 'it_IT') #1 /home/cleod16a/public_html/wp-includes/class-wp-fatal-error-handler.php(46): load_default_textdomain() #2 [internal function]: WP_Fatal_Error_Handler->handle() #3 {main} thrown in /home/cleod16a/public_html/wp-includes/l10n.php on line 800