Cron reschedule event error for hook could_not_set or saved [Solved]

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Cron reschedule event error for hook could_not_set or saved [Solved]

In the intricate web of website management, even the most seemingly straightforward tasks can unravel into complex puzzles. As a diligent webmaster, I found myself entangled in one such conundrum when a recurring issue surfaced on my website, disrupting the harmonious flow of its operations.

Cron reschedule event error for hook: action_scheduler_run_queue, Error code: could_not_set, Error message: The cron event list could not be saved., Data: {“schedule”:”every_minute”,”args”:[“WP Cron”],”interval”:60}

Cron unschedule event error for
hook: twicedaily, Error code:
could_not_set, Error message:
The cron event list could not
be saved., Data: {“schedule”:false,”args”:
“clean_user_online_status”}

It all began with the discovery of a dissonance between two vital components of WordPress's infrastructure: the cron stored in alloptions within the object cache and the cron nestled in wp_options within the database. These twin repositories held the temporal heartbeat of my website, orchestrating crucial tasks and ensuring its smooth functioning.

However, to my dismay, these crucial cron values diverged, casting a shadow of uncertainty over the reliability of my site's operations. This incongruity was not merely a matter of inconvenience but a potential catalyst for chaos, as the discrepancies could lead to missed updates and disrupted schedules.

Upon delving deeper into the labyrinth of WordPress's inner workings, I unearthed the root cause of this perplexing disparity. Functions like update_option, tasked with maintaining the integrity of these cron values, lacked the mechanism to assert exclusive control over their manipulation. This laissez-faire approach meant that multiple processes or threads, not just concurrent cron operations, could tamper with these crucial values concurrently.

The insidious nature of this issue lay in its subtlety. While update_option implemented a cautious check based on the object cache to ensure that values were only updated if they had truly changed, the same prudence was not extended to the database. Consequently, the database value remained vulnerable, devoid of the safeguard against inadvertent updates that its cached counterpart enjoyed.

Armed with this newfound understanding, I embarked on a quest to rectify this discrepancy and restore equilibrium to my website's temporal domain. In a stroke of inspiration, I devised a simple yet potent solution: a strategic intervention in the form of code injection into the sanctuary of my theme's functions.php file.

With precision and purpose, I inserted a command to obliterate the cached cron values, signaling a clean slate for their resurrection. This act of purging, achieved through the invocation of wp_cache_delete('alloptions', 'options'), served as a catalyst for reconciliation, bridging the chasm between the cached and database cron values.

As the code took effect, a palpable sense of relief washed over me, akin to the tranquil calm after a tempestuous storm. With the cron values realigned and the mechanisms of control fortified, my website regained its footing, poised once more to navigate the digital landscape with confidence and poise.

In retrospect, this saga served as a poignant reminder of the intricate interplay between code and consequence in the realm of website management. It underscored the importance of vigilance and proactive intervention in the face of subtle yet potent vulnerabilities lurking beneath the surface.

Armed with newfound knowledge and a steadfast resolve, I emerged from this ordeal not merely unscathed but empowered, ready to confront future challenges with equanimity and fortitude. For in the ever-evolving landscape of web development, it is not the challenges themselves that define us but our response to them that shapes our journey forward.


To further troubleshoot a cron reschedule event error, you can check a few things:

  • Cron Syntax: Ensure that the cron expression used for rescheduling is correct. A small mistake in the syntax can lead to errors. Double-check the format and make necessary corrections.
  • Log Files: Examine your server’s log files for any error messages related to the cron job. The logs can provide valuable information about what went wrong.
  • Permissions: Verify that the user running the cron job has the necessary permissions to execute the reschedule event. File and directory permissions should be set appropriately.
  • Environment Variables: Some cron jobs may depend on specific environment variables. Make sure that these variables are set correctly for the cron environment.
  • Debugging Statements: Insert debugging statements or logging into your PHP code to trace the execution flow. This can help pinpoint where the issue is occurring.
  • PHP Version: Ensure that the version of PHP used by the cron job is compatible with the code. Some functions or features may behave differently across PHP versions.

By systematically checking these aspects, you can often identify and resolve issues with cron reschedule events. If you can provide more specific details or error messages, I may be able to offer more targeted assistance.