Fatal error: Maximum execution time of 30 seconds exceeded in D:\xampp\htdocs\wordpress\wp-includes\rewrite.php on line 14

Fatal error: Uncaught Error: Call to a member function set() on null in D:\xampp\htdocs\wordpress\wp-includes\l10n.php:856 Stack trace: #0 D:\xampp\htdocs\wordpress\wp-includes\l10n.php(959): load_textdomain('default', 'D:\\xampp\\htdocs...', 'zh_CN') #1 D:\xampp\htdocs\wordpress\wp-includes\class-wp-fatal-error-handler.php(49): load_default_textdomain() #2 [internal function]: WP_Fatal_Error_Handler->handle() #3 {main} thrown in D:\xampp\htdocs\wordpress\wp-includes\l10n.php on line 856