Can not create changeset on stream using RTC java api

 public void addFileToStream(IWorkspaceConnection workspace, ITeamRepository iTeamRepository) {
        IProgressMonitor monitor = new NullProgressMonitor();
        List<IComponentHandle> components;
        try {
            components = (List<IComponentHandle>) workspace.getComponents();
            for (IComponentHandle iComponentHandle : components) {
                try {
                    // add a folder called 'project' to the workspace
                    IFlowTable flowtable = workspace.getFlowTable().getWorkingCopy();
                    IFlowEntry[] targets = (IFlowEntry[]) flowtable.deliverTargets().toArray(new IFlowEntry[flowtable.deliverTargets().size()]);
                    for(IFlowEntry target:targets)
                    {
                        flowtable.addDeliverFlow(workspace.getResolvedWorkspace(), iTeamRepository.getId(), iTeamRepository.getRepositoryURI(), null,
                                workspace.getDescription());
// get the node just added
                        IFlowEntry newnode = flowtable.getDeliverFlow(workspace.getResolvedWorkspace());
// record if this target flow node should be current or default
                        if(target.equals(flowtable.getCurrentDeliverFlow()))
                        {
                            flowtable.setCurrent(newnode);
                        }
                        if(target.equals(flowtable.getDefaultDeliverFlow()))
                        {
                            flowtable.setDefault(newnode);
                        }
                    }
                    workspace.setFlowTable(flowtable, null);
                    IChangeSetHandle cs1 = workspace.createChangeSet(iComponentHandle, monitor);
                    IFolder rootFolder = (IFolder) workspace.configuration(iComponentHandle).rootFolderHandle(monitor);
                    // create source folder ("/project")
                    IFolder projectFolder = (IFolder) IFolder.ITEM_TYPE.createItem();
                    projectFolder.setParent(rootFolder);
                    projectFolder.setName("00_PJM_Overall");
                    workspace.commit(cs1, Collections
                            .singletonList(workspace.configurationOpFactory().save(projectFolder)), monitor);
                    // add a file called 'file.txt' under the 'project' folder.
                    IFileItem file = (IFileItem) IFileItem.ITEM_TYPE.createItem();
                    file.setName("file.txt");
                    file.setParent(projectFolder);
                    IFileContentManager contentManager = FileSystemCore.getContentManager(iTeamRepository);
                    IFileContent storedContent = null;
                    storedContent = contentManager.storeContent(
                            IFileContent.ENCODING_US_ASCII,
                            FileLineDelimiter.LINE_DELIMITER_PLATFORM,
                            new VersionedContentManagerByteArrayInputStreamPovider("The contents of my file.txt".getBytes()),
                            null, monitor);
                    file.setContentType(IFileItem.CONTENT_TYPE_TEXT);
                    file.setContent(storedContent);
                    file.setFileTimestamp(new Date());
                    workspace.commit(cs1, Collections
                            .singletonList(workspace.configurationOpFactory().save(file)), monitor);
                    // deliver the changes to the stream
                    IChangeHistorySyncReport sync =
                            workspace.compareTo(workspace, WorkspaceComparisonFlags.CHANGE_SET_COMPARISON_ONLY,
                                    Collections.EMPTY_LIST, monitor);
                    workspace.deliver(workspace, sync, Collections.EMPTY_LIST,
                            sync.outgoingChangeSets(iComponentHandle), monitor);
                    monitor.subTask("Created changes and delivered to " + workspace.getName());
                } catch (TeamRepositoryException e) {
                    e.printStackTrace();
                }
                break;
            }
        } catch (TeamRepositoryException e) {
            e.printStackTrace();
        }
  }
    

But I am getting error as follows:
    

com.ibm.team.scm.common.InvalidStreamOperationException: Change sets cannot be created on a stream
    

I have followed code from snippets of IBM.
    

Please let me know what is missing with my code.
    

Thanks in advance.
    

Arati