Error in IResourceContext

Hi Experts,

I need your valuable advice in fixing below problem.

In my PDK development to convert byte data(receives from other application) to documents and to upload that document to KM folders,

I am stuck with below error:

   IServiceUserFactory userfact=UMFactory.getServiceUserFactory();

   IUser sapUser = userfact.getServiceUser("cmadmin_service");

   IResourceContext ctx = ResourceContext.getInstance(sapUser);

java.lang.NoClassDefFoundError: com/sapportals/portal/security/usermanagement/UserManagementException

at com.sap.coll.km.uploadDoc.doContent(uploadDoc.java:63)

I have added the references tc/je/usermanagement/api ,tc/epbc/prt/api

and the dev environment is 7.3.