Fatal error: Cannot declare class WP_Metadata_Lazyloader, because the name is already in use in /home/meccontr/public_html/wp-includes/class-wp-metadata-lazyloader.php on line 32

Fatal error: Uncaught Error: Class "WP_Translation_Controller" not found in /home/meccontr/public_html/wp-includes/l10n.php:801
Stack trace:
#0 /home/meccontr/public_html/wp-includes/l10n.php(960): load_textdomain('default', '/home/meccontr/...', 'fr_FR')
#1 /home/meccontr/public_html/wp-includes/class-wp-fatal-error-handler.php(49): load_default_textdomain()
#2 [internal function]: WP_Fatal_Error_Handler->handle()
#3 {main}
  thrown in /home/meccontr/public_html/wp-includes/l10n.php on line 801