Fatal error: Uncaught Error: Call to undefined function register_widget()
in /srv/users/serverpilot/apps/berkatjaya/public/wp-includes/widgets.php on line 1730

Call stack:

1. wp_widgets_init()
   wp-includes/class-wp-hook.php:287
2. WP_Hook::apply_filters()
   wp-includes/class-wp-hook.php:311
3. WP_Hook::do_action()
   wp-includes/plugin.php:478
4. do_action()
   wp-settings.php:551
5. require_once()
   wp-config.php:96
6. require_once()
   wp-load.php:37
7. require_once()
   wp-blog-header.php:13
8. require()
   index.php:22