Because you are running an older version of Data ONTAP it also only supports an older version of the API. You can specify the version of API to use when you crate the NaServer object
From the SDK java docs:
public NaServer(java.lang.String serverName,
Create a server API object with server type SERVER_TYPE_FILER
Parameters: serverName - The name of the API server. majorVersion - The major API version number required, for example "1" if version 1.0 is required. minorVersion - The minor API version number required, for example "0" if version 1.0 is required.
For DataFabric Manager APIs, pass 1.0 as the major and minor version numbers.
Throws: java.net.UnknownHostException - if the hostname is not known.
So simply update the major, minor to be 1, 13 and you should be able to connect to this older system.
Cheers, Chris Madden
Storage Architect, NetApp EMEA (and author of Harvest)