Webdynpro and uwl

Hi,
I'm trying to use the UWL-API as described here within my Web Dynpro-App. My coding looks somehow like this:
IUWLService uwlService=(IUWLService)PortalRuntime.getRuntimeResources().getService(IUWLService.ALIAS_KEY);
UWLContext myContext = new UWLContext();
try {
IUWLSession mySession = uwlService.getUwlSessionForWebDynproClient(myContext);
} catch (Exception e) {
IWDMessageManager myMan = wdComponentAPI.getMessageManager();
myMan.reportSuccess(e.toString());
Well when i deploy that app and run it (i integrated the app into an iview, although i'm not sure whether have to or not) i get the following error:
java.lang.NoClassDefFoundError: com/sap/netweaver/bc/uwl/IUWLSession
Maybe i have to add a sharing reference or s.th. similar in order to use that API?
I'll reward points for any useful answer.
thanks a lot

Hi,
I just tried to execute the same in my portal, It returns "Portal Runtime Error", I have declared the library reference and also included the corresponding JAR files.
Can u just guide me the the steps u followed to achieve the task to trigger a notification from WebDynpro.
Regards / Guru

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Thanks a lot for all your replies..
The workitem type registration has been done already, but still it doesn't work..
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