Fatal error: Cannot declare class WP_Block_Parser_Block, because the name is already in use in C:\inetpub\joventut\wp-includes\class-wp-block-parser.php on line 15

Fatal error: Uncaught Error: Call to a member function set() on null in C:\inetpub\joventut\wp-includes\l10n.php:784 Stack trace: #0 C:\inetpub\joventut\wp-includes\l10n.php(872): load_textdomain('default', 'C:\\inetpub\\jove...', 'es_ES') #1 C:\inetpub\joventut\wp-includes\class-wp-fatal-error-handler.php(47): load_default_textdomain() #2 [internal function]: WP_Fatal_Error_Handler->handle() #3 {main} thrown in C:\inetpub\joventut\wp-includes\l10n.php on line 784