There are no other devices (ESS and/or FAStT) discovered.
Check if there are other devices (ESS and/or FAStT) connected (physically) to the SAN Fabric and/or also if the other devices (ESS and/or FAStT) and/or this SAN Volume Controller are properly configured to see each others (check if there are firewalls or ACLs that blocks to see each others and/or the ports of these devices and SAN Volume Controller ports can see each others). Make sure that all MDM discovered devices have inventory collection completed.