The WordPress scheduled cache purge error occurs when the system attempts to execute automated cache cleaning tasks but fails to complete them successfully. This happens when the WP-Cron system responsible for scheduling these tasks experiences issues, either due to server configuration problems, insufficient website traffic, or conflicts with other plugins.
The error indicates that your caching mechanism cannot automatically clean outdated content, leading to potential performance issues and stale content being served to visitors. The root cause often involves problems with the Action Scheduler table in your database or improper setup of WordPress’s cron system.