Fatal error: Uncaught Error: str_replace(): Argument #3 ($subject) must be of type array|string, WP_Error given
in /var/www/dev.w8shipping.ua/wp-includes/pluggable.php on line 1455

Call stack:

1. str_replace()
   wp-includes/pluggable.php:1455
2. wp_sanitize_redirect()
   wp-includes/pluggable.php:1416
3. wp_redirect()
   wp-content/themes/w8-shipping/404.php:73
4. include()
   wp-includes/template-loader.php:106
5. require_once()
   wp-blog-header.php:19
6. require()
   index.php:17