COPY TO SYNTAX help

Hi I am receiving thie error when doing COPY TO with crate command:

crash --hosts 127.0.0.1 -c “copy metermaster22 to DIRECTORY ‘/crateBackup’”
CONNECT OK
SQLActionException[NotSerializableExceptionWrapper: unhandled server_exception: Failed to open output: '/crateBackup/metermaster22_2 .json (No such file or directory)’]

Please advice on the proper syntax. I have tried changing permissions and manually creating an output file first

https://crate-community.slack.com/archives/C0L7GCE6R/p1539598394000100