Fatal error: Cannot declare class WP_Metadata_Lazyloader, because the name is already in use in D:\inetpub\webs\alessandromarzianoit\wp-includes\class-wp-metadata-lazyloader.php on line 32

Fatal error: Uncaught Error: Call to a member function set() on null in D:\inetpub\webs\alessandromarzianoit\wp-includes\l10n.php:806 Stack trace: #0 D:\inetpub\webs\alessandromarzianoit\wp-includes\l10n.php(900): load_textdomain() #1 D:\inetpub\webs\alessandromarzianoit\wp-includes\class-wp-fatal-error-handler.php(47): load_default_textdomain() #2 [internal function]: WP_Fatal_Error_Handler->handle() #3 {main} thrown in D:\inetpub\webs\alessandromarzianoit\wp-includes\l10n.php on line 806