Issue

In Drupal 8, after upgrading Simple XML sitemap from 8.x-3.1 to the latest version, I can no longer access my website and it is showing the following error message.

Error: Class 'Drupal\simple_sitemap\PathProcessor\PathProcessorSitemapVariant' not found in Drupal\Component\DependencyInjection\Container->createService() (line 265 of core/lib/Drupal/Component/DependencyInjection/Container.php).

I was block out of my website. Trying any URL path will show the message "The website encountered an unexpected error. Please try again later."

Solution

You need to run the following 2 pending updates of the simple_sitemap module:

• 8301 - Changing id and delta fields of simple_sitemap table from smallint to int.
• 8302 - Removing unused batch_process_limit key from simple_sitemap.settings configuration.

In order to do this, simply open https://your-wesbiste/update.php and follow the instructions.

More details about this issue can be found at https://www.drupal.org/project/simple_sitemap/issues/3057681.