Error in src/garlicoin/client.cr:60: instantiating 'Garlicoin::Client#backup_wallet(String)'
puts client.backup_wallet("/home/watzon/Desktop")
^~~~~~~~~~~~~
in src/garlicoin/client.cr:40: instantiating 'call?(JsonRpc::EmptyResponse:Class, String, Array(String))'
call?(JsonRpc::EmptyResponse, "backupwallet", [destination])
^~~~~
in lib/json_rpc/src/json_rpc/client.cr:117: undefined method 'result' for JsonRpc::EmptyResponse
response.result
^~~~~~
Rerun with --error-trace to show a complete error trace.