Sometimes you might come across some errors as follows, when you start services in servers.
Failed to start crond.service: The name org.freedesktop.PolicyKit1 was not provided by any .service files
Nothing to worry, it could just be because you don’t have the proper permission to do so, or you failed to add a ‘sudo’ infront of the command. Juts try with sudo and it will work.
[abc@greproot ~]$ sudo systemctl start crond.service
[abc@greproot ~]$ sudo systemctl status crond.service
● crond.service – Command Scheduler
Loaded: loaded (/usr/lib/systemd/system/crond.service; enabled; vendor preset: enabled)
Active: active (running) since Thu 2020-05-28 10:29:05 UTC; 10s ago