Problem in Starting a GP Process from Webdynpro Code

Hi Experts
I have a problem in starting a GP Process from webdynpro code. I have imported the following used DCs in my Webdynpro DC
caf/eu/gp/api/wd
caf/eu/gp/api (external)
com.sap.security.api.sda
Once I deploy I get the following error. No Syntax, Build errors in the application.
java.lang.NoClassDefFoundError: com/sap/caf/eu/gp/process/rt/api/IGPRuntimeManager
I have used the following code to start the GP Process - getUserDetails Context is of type IUser
          //Starting GP Process
try {
IGPRuntimeManager rtm = GPProcessFactory.getRuntimeManager();
IGPProcessRoleInstanceList roles = rtm.createProcessRoleInstanceList();
IGPUserContext userContext = GPContextFactory.getContextManager().createUserContext(
     wdContext.currentContextElement().getUserDetails());
IGPProcess process = GPProcessFactory.getDesigntimeManager().getActiveTemplate(
                    "00A897714C5A11DE8E33005056A260C3", userContext);
IGPStructure params = GPStructureFactory.getStructure(process.getInputParameters());
IGPProcessInstance prInstance = rtm.startProcess(process,
                    "New User Registration Process",
                    "New User Registration Process",
                    wdContext.currentContextElement().getUserDetails(),
                    roles,
                    params,
                    wdContext.currentContextElement().getUserDetails());
} catch (Exception e) {
     e.printStackTrace();
Please do the needful EXPERTS.
FYI... SP17
Thank you
Best Regards
Ramamoorthy D

Hi Ram,
You have to add Library reference to your DC.
in the context menu of your DC select
properties->webdynproReferences->LibraryReference
add sap.com/cafeugp~api as refernce.
I hope this will solve your problem.
Regards,
Rajesh

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