Magento 2.2.3 cron Errors how to solve?

Question

we are running website Magento 2.2.3 CE version. We are getting an error in cron.log please advise?

1. cron.log

Warning: require_once(/srv/public_html/update/vendor/autoload.php): failed to open stream: No such file or directory in /srv/public_html/update/app/bootstrap.php on line 15

2. update.log

   We did some R&D and found that vendor directory was missing in /srv/public_html/update/ then we have moved vendor directory to respected path now the above error gone but getting below error.

Update-cron.ERROR: Cron readiness check failure! Found non-writable paths

3. exception.log

[2019-01-29 06:40:06] main.CRITICAL: No callbacks found {"exception":"[object] (Exception(code: 0): No callbacks found at /srv/public_html/vendor/magento/module-cron/Observer/ProcessCronQueueObserver.php:278)"} []

How to fix these error? Can any one help? Thanks

Answer 1

It seems relate to Magemojo configuration. I got the same issue as your issue and I am contacting to magemojo to support. I have two site one use Stratus and it is getting this issue other site is fine without use Status and same source code.

Answer 2

As explained here: https://devdocs.magento.com/guides/v2.3/comp-mgr/prereq/prereq_cron.html

This error you're facing is related to the Magento Update/Upgrade scripts. At the end of that Magento article they explain what to do when you get this error:

In Composer-based installations, Magento creates the update/ directory when you run composer create-project. Running composer install does not create the update/ directory (if it did not exist before). See Recreate the Magento updater.

In any case, if you do not plan to upgrade your magento this way, you should consider removing the cron line automatically added by magento (the line should look like this):

php /var/www/yourwebsite.com/update/cron.php >> /var/www/yourwebsite.com/var/log/update.cron.log