Title: wp cron error msg issue
Last modified: August 12, 2024

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# wp cron error msg issue

 *  Resolved [larry.bradley](https://wordpress.org/support/users/larrybradley/)
 * (@larrybradley)
 * [1 year, 10 months ago](https://wordpress.org/support/topic/wp-cron-error-msg-issue/)
 * I frequently get the following error message in my php error log:
 * _Error code: invalid\_schedule_, _Error message: Event schedule does not exist_
 * This seems to occur when a plugin has a cron hook installed, but there is no 
   cron event in the wp_options table in the ‘cron’ entry.
 * I have talked with a plugin developer, and in his case, they have added to hook,
   and later their plugin might create a schedule for that hook. But meantime: error
   messages.
 * I don’t believe that this is a true “error”, but merely a statement of fact. 
   In the PHP scheme of things, it could a notification level message, not an error
   level one, which can be filtered out. Or it could just be ignored. Since there
   is nothing that I, as the programmer for the website can do about it, and that
   plugin developers don’t care about this, perhaps the WP cron code could handle
   this better.
 * Thanks
    -  This topic was modified 1 year, 10 months ago by [Steven Stern (sterndata)](https://wordpress.org/support/users/sterndata/).

Viewing 5 replies - 1 through 5 (of 5 total)

 *  [Alan Fuller](https://wordpress.org/support/users/alanfuller/)
 * (@alanfuller)
 * [1 year, 10 months ago](https://wordpress.org/support/topic/wp-cron-error-msg-issue/#post-17951010)
 * This occurs when something (not core but a plugin or theme ) tries to schedule
   an event with a non default period ( WordPress has hourly, twice daily, daily,
   weekly )
   The message isn’t as useful as it could be as it doesnt say what period
   is missing.But it is valid to log an error because something is not coded right,
   either the plugin is not correctly adding the period ( or less likely something
   else is removing what the plugin added ) and so the events will not run and the
   site will not operate as expected.
 * As developer of the website there is several things you can do, ideally investigate
   what period the plugin is trying to schedule and bring it to the attention of
   the plugin dev, or alternatively if the plugin dev is not responsive you can 
   filter the cron schedules and add the missing one yourself.
   If you are so inclined,
   you can search the plugins looking for
 *     ```wp-block-code
       wp_schedule_event
       ```
   
 * which should give you the named schedules
 *  Thread Starter [larry.bradley](https://wordpress.org/support/users/larrybradley/)
 * (@larrybradley)
 * [1 year, 10 months ago](https://wordpress.org/support/topic/wp-cron-error-msg-issue/#post-17952758)
 * That does not appear to be the problem in my case. There are several plugins 
   that schedule events at a non-standard interval, and none of them result in the
   error message. It is only plugins that have a hook, but have not scheduled anything
   to run. There are no entries in the “cron” row in the options file. One plugin
   has the hook, but only sets up a schedule for the “pro” version. Another admin-
   only plugin has the hook, but only sets up a schedule if there is a situation
   where there may be a queue of requests.
 * I think that this is a legitimate situation. You set up the hook in case you 
   need it later.
 * In the case of the admin plugin, which wants to run every 2 minutes, I just disabled
   the plugin, and the messages go away, since the plugin never gets loaded. I will
   just enable it when I need it, and put up with the errors. In the case of the
   other plugin, it only happens every day or so. I contact these people, and they
   will fix the problem.
 *  [Alan Fuller](https://wordpress.org/support/users/alanfuller/)
 * (@alanfuller)
 * [1 year, 10 months ago](https://wordpress.org/support/topic/wp-cron-error-msg-issue/#post-17953656)
 * The error message you get is becuase an event is trying to schedule for a non
   registered period.
   The registered periods are not kept in the database, they 
   are an array that is filtered by code.There are only 2 places that error is created
   and both check that array.Basically the error can only happen if a plugin is 
   doing something wrong. So it is valid to be an error IMHO.In this case is seems
   the admin plugin you refer to has forgotten to filter the array to add a 2 minute
   period, so the error has surfaced that. I can also tell you that if the period
   is not defined, it won’t schedule, so nothing in the cron table, this is clear
   from the code.If you still would like to propose a change you can do so by raising
   a trac ticket [https://core.trac.wordpress.org/newticket](https://core.trac.wordpress.org/newticket)
 *  Thread Starter [larry.bradley](https://wordpress.org/support/users/larrybradley/)
 * (@larrybradley)
 * [1 year, 10 months ago](https://wordpress.org/support/topic/wp-cron-error-msg-issue/#post-17954000)
 * Many thanks for taking the time to discuss this with me. I obviously do not understand
   completely how the cron stuff works, but you have given me some ideas as to where
   to look at the plugin code to see what is going on there.
 *  Thread Starter [larry.bradley](https://wordpress.org/support/users/larrybradley/)
 * (@larrybradley)
 * [1 year, 9 months ago](https://wordpress.org/support/topic/wp-cron-error-msg-issue/#post-17958489)
 * I actually found the problem, thanks to you pointing me in the right direction.
   The plugin was doing the add_filter thing to register the 2 minute interval. 
   And that was working. The problem occurred in the wp_schedule_event() call. The
   interval name was not in quotes:
 * wp_schedule_event( time(), $this->cron_id . ‘_interval’, $this->cron_id );
 * I changed it to
 * wp_schedule_event( time(), ‘ns_cloner_cron_interval’, $this->cron_id );
 * and all is well. No errors, the event shows up in the cron schedule. Now I will
   pass this on to the plugin author.
 * Thanks again!

Viewing 5 replies - 1 through 5 (of 5 total)

The topic ‘wp cron error msg issue’ is closed to new replies.

 * In: [Fixing WordPress](https://wordpress.org/support/forum/how-to-and-troubleshooting/)
 * 5 replies
 * 2 participants
 * Last reply from: [larry.bradley](https://wordpress.org/support/users/larrybradley/)
 * Last activity: [1 year, 9 months ago](https://wordpress.org/support/topic/wp-cron-error-msg-issue/#post-17958489)
 * Status: resolved

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