All of a sudden an application named dnf (a successor of yum, used as package manager on Oracle Linux OS) stopped functioning, but throwing the message from the title, even when it's being called with help option(s). The main cause was local machine time, it wasn't synchronized with real clock time. The solution was to sync it, as well as modify the chrony.conf (add string like 'server vm_host iburst' in order to sync time quickly after save_vm->restore_vm operation) and run the dnf with required options :
# systemctl stop chronyd
# chronyd -q 'pool pool.ntp.org iburst'
# systemctl start chronyd
# dnf help
Good Luck !
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