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

Fatal error: Uncaught Error: Call to a member function set() on null in /htdocs/wp-includes/l10n.php:786 Stack trace: #0 /htdocs/wp-includes/l10n.php(874): load_textdomain('default', '/htdocs/wp-cont...', 'fr_FR') #1 /htdocs/wp-includes/class-wp-fatal-error-handler.php(47): load_default_textdomain() #2 [internal function]: WP_Fatal_Error_Handler->handle() #3 {main} thrown in /htdocs/wp-includes/l10n.php on line 786