PHP server log error

[tibesararchives]

Hello,

I noticed the following error in our server's error log:

[Wed Jan 03 15:42:18.104380 2024] [fcgid:warn] [pid 4111066:tid 140486912132864] [host www.tibesar.family] [client 2604:4f00:10:dcc3:0:56:515:1:43812] Cron unschedule event error for hook: newspack_newsletters_tracking_pixel_process_log, Error code: could_not_set, Error message: The cron event list could not be saved., Data: {"schedule":false,"args":[]}

Is this an issue with Newspack Newsletters or the WP Crontrol plugin please?

Thank you very much!