Fatal error: Cannot redeclare wp_add_editor_classic_theme_styles() (previously declared in D:\web\localuser\naphta\www\wp-includes\deprecated.php:6438) in D:\web\localuser\naphta\www\wp-includes\script-loader.php on line 3326

Fatal error: Uncaught Error: Call to a member function set() on null in D:\web\localuser\naphta\www\wp-includes\l10n.php:857
Stack trace:
#0 D:\web\localuser\naphta\www\wp-includes\l10n.php(960): load_textdomain()
#1 D:\web\localuser\naphta\www\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:\web\localuser\naphta\www\wp-includes\l10n.php on line 857