I disabled wp cron in wpconfig as the plugin (wprocket) instructed me and created cron job on the server … now I find that message.
I contacted host and they said that the cron job is working fine.
And how do you think this is related to Cloudflare?
If the instruction of WP Rocket are unclear/missleading, please contact their support. More infos about WP Rocket you will find here: wp-rocket.me