This article explains the possible cause for the failure: ERROR: "Selected writer 'Dhcp Jet Writer' is in failed state!" shown in the VSS log when creating a disk image with Macrium Reflect.
If you see the following text in the log:
Then it's likely your DHCP service has a stale state and needs to be restarted.
To view the VSS log for a backup, click the 'Log' tab, expand the date and time nodes for the backup and click the 'VSS Log' node.
Start the service manager and restart the DHCP Server service. To start the Service manager, click 'Start', type 'Services' and press Enter.