Cron script readiness check failed

[senani_m]

I am trying to install an extension on Magento 2.2.4 but I am getting the following error. I have alredy set the crontab as well.

What can be the issue here ? 

[Rakesh Jesadiya]

You can manually add extension using below way,

Just go to Magento root with app/code

Now Extract your module under code folder and run below command to install your extension,

php magento setup:upgrade
php magento setup:static-content:deploy -f
php magento cache:flush