How to deliver the Set of changesets using plain client library ?

Hello team

I am currently checking in my change set using below code :

 fRepoWsConn.commit(fChangeSet, Collections
                         .singletonList(fRepoWsConn.configurationOpFactory()
                                 .save(fileWorkingCopy)), fMonitor);
          
But when i try to deliver the a list of change sets using below code i get the following error:
Exception in deliverChangesets()...details :com.ibm.team.process.common.advice.TeamOperationCanceledException: 'Deliver' failed. Preconditions have not been met: A work item or change request must be associated with the change set and a comment must be set.

 for(IChangeSetHandle fChangeSet:changesetList){
          
              List<ILink> links = fileSystemWorkItemManager.createLink(
 streamHandle, changeSet,
     new IWorkItemHandle[] { (IWorkItemHandle) workitem
             .getItemHandle() }, null);

IChangeHistorySyncReport sync = fWorkspace.compareTo(streamWsConn,
     WorkspaceComparisonFlags.CHANGE_SET_COMPARISON_ONLY,
     Collections.EMPTY_LIST, fMonitor);

fWorkspace.deliver(streamWsConn, sync, Collections.EMPTY_LIST,
     sync.outgoingChangeSets(compHandle), fMonitor);

I am able to deliver one change set and deliver the same in one shot ,But unable to deliver the set of Chnagesets?

Any idea on this ??