I/O error Command failed with code 1

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Getting this error repeatedly when attempting to replicate from my local TrueNAS to a remote TrueNAS machine over VPN. Both are running TrueNAS-12.0-U4 with no errors reported other than this one. Help!

Replication "TrueNASBackup" failed: I/O error Command failed with code 1

 

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Bueller? Bueller?

 

[Heracles]

Try to replicate manually from the CLI and add the -v option. That may give you more info about whatever is wrong here.