Replication Error: Object Reference not set to an instance of an object (88489)

When trying to replicate any VM from/to certain host all tasks/jobs fail with: Error Message: Object Reference not set to an instance of an object.

Please check "Licensed Features" on your ESX(i) host so it doesn't look like this:

As you see there is nothing in "Product Features" including "vStorage APIs" or Hot-Pluggable virtual HW (Hot Add)

,

The VMware licensing is not applied correctly or missing.

This is correct image how VMware Enterprise licensing should look:

Please reapply or add licensing to your ESX hosts.

To compare vSphere Acceleration Kits please go here: "VMware vSphere^TMfor SMBs"

What type of vMware vSphere Licensing I need to backup my ESXi servers?