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It’s a warning that shows up if the Koko background tasks aren’t completed in time. If you have a very low traffic site, or the site you’re testing on is a staging site or such, it can be that wpCron wasn’t triggered because there were no visits to trigger it.
Another reason can be that another cron job from another plugin is clogging up the queue and taking a long time to complete.
With the Advanced Cron Manager plugin you can monitor the cron queue and delete any task that stays stuck on top of the queue.
You can also set up a normal cron job in your hosting control panel that hits yoursite .com/wp-cron.php every 5 minutes, to prevent the low site traffic issues.
Hope that helps. If you have any questions, please let me know!