Query Disk Mappings API

Getting ServerSOAPFaultException when I tried to Query Disk Mappings using  VSAN API. Please find the error message and the code snippet below for your reference .

Error Message:

com.sun.xml.internal.ws.fault.ServerSOAPFaultException: Client received SOAP Fault from server: Unknown type (VsanVcDiskManagementSystem) Please see the server log to find more detail regarding exact cause of the failure.

Code snippet:

ManagedObjectReference managedObjectReference = new ManagedObjectReference();

managedObjectReference.setType("VsanVcDiskManagementSystem");

managedObjectReference.setValue("vsan-disk-management-system");

ManagedObjectReference clusterObj = new ManagedObjectReference();

clusterObj.setType(cluster.getMOR().getType());

clusterObj.setValue(cluster.getMOR().getVal());

List<VimVsanHostDiskMapInfoEx> vimVsanHostDiskMapInfoExList = healthPort.queryDiskMappings(managedObjectReference, clusterObj);

Kindly let me me know, how to use the queryDiskMappings API.

Thanks in advance