It is observed that a Replication job fails immediately with "Object reference not set to an instance of an object".
Only source and destination hosts are added to vRanger inventory.
When the Replication job is created, destination is shown as N/A - There should be an IP or FQDN of the destination host.
Credential the ESXi host with a local user, preferably root user.
Create a new job and the destination host will be visible with an IP or the FQDN.