Unable to take backup of one Hyper-V server in quest rapid recovery tool

I'm unable to take backup of one Hype-V server. Agentless backup is configured for this server.

OS version of the client server is:-Microsoft windows server 2012 R2 standard

Rapid recovery agent version:-6.0.1.609

Problem I'm facing described below:-

The transfer failed: 'Call to service method https://servername:8006/apprecovery/api/agent/transfer/snapshots POST failed: Failed to call Create File on disk '\\.\PhysicalDrive0' - The process cannot access the file because it is being used by another process'
Failed to call Create File on disk '\\.\PhysicalDrive0' - The process cannot access the file because it is being used by another process

VSS writer components are no error state and server rebooted 21 days ago.

Please help me to  resolve the issue

Thanks

Sujoy

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