Acronis Backup: backup fails with "No volumes have been found while processing the 'Fixed Volumes' template"

You have installed Agent for VMware (Windows) on a machine running Windows. You are backing up this Windows machine.

Backup fails with:

Error code: 6
Module: 377
LineInfo: 0x20E8C00E3FF3FA4F
Fields: {"$module":"agent_protection_addon_vsa64_7001"}
Message: No volumes have been found while processing the 'Fixed Volumes' template.