Export projectArea ProcessTemplate using API

Hi Team,

I am trying to export projectArea template using below Java API.
IContent content =
        ((IProcessInternalClientService) this.teamRepo.getClientLibrary(IProcessInternalClientService.class))
            .createProcessDefinitionExportZip(templateId, new SubProgressMonitor(subProgressMonitor, 200));

But its giving below error
java.lang.IllegalArgumentException: invalid UUID
    at com.ibm.team.repository.common.UUID.valueOf(UUID.java:108)
    at com.ibm.team.process.internal.service.ProcessService.exportProcessDefinitionWithParticipants(ProcessService.java:969)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:95)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:56)
    at java.lang.reflect.Method.invoke(Method.java:620)

If in place of template , if i pass the processDefination instance, then its working fine.

Another issue i am facing is : i am not able to export updated project area template. that means, for example if i add some of the new attributes to the project area and then try to export. new contents are not exported.