Unable to retrieve next block transmission command

[Andreas Neufert]

"Error: bad allocation Failed to upload disk. Skipped arguments: [shadowSpec>]; Agent failed to process method {DataTransfer.SyncDisk}. Exception from server: Reconnectable protocol device was closed. Unable to retrieve next block transmission command. Number of already processed blocks: [418]. Failed to download disk"

In my case the problem was a lack of memory on the host (less than 2GB free). Freeing up the host memory solved the problem. Backup of all virtual machines on the host did not work.
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Thanks for sharing this with the community here.