what is technical reason for unsupported 'ceph-iscsi' config version...?

Rancher Academy SES202 SUSE Enterprise Storage Data Access
1

In the page #29 of its lab mannual, what is technical reason for unsupported ‘ceph-iscsi’ config version…?

2

It is my understanding that MON1 has newer code installed that is not present on MON2 and MON3. That is the cause of the issue.

3

Thanks!