Fatal error after saving new node or custom block

I’ve got an issue every time I create/save new nodes or blocks I’ve got this message: The website encountered an unexpected error. Please try again later. In the Recent log messages, I can see the following message: InvalidArgumentException: Class “Drupalcontent_moderationPluginValidationConstraintModerationStateConstraintValidator” does not exist. in DrupalCoreDependencyInjectionClassResolver->getInstanceFromDefinition() (line 24 of /website.com/core/lib/Drupal/Core/DependencyInjection/ClassResolver.php). Drupal version[…]