Everything after the first argument is key-value pairs, so two arguments are needed

{"/home/sean/go/src/github.com/hyperledger/burrow/cmd/burrow/.keys/data/D0E535B30D2DE3AEC591F5D03E3D5DF5E0536936.json":"(MISSING)","component":"keys","log_channel":"Info","message":"file should be accessible by user only","run_id":"eaa9871a-7557-11e8-84bd-968f9588dc8f","scope":"NewKeyStore"}

Signed-off-by: Sean Young <sean.young@monax.io>