Error while creating a RFC model for WD for Java

Hi,
While trying out the example(TutWD_FlightList_Init.zip) for model programming in the NDS,I got the following error when I try to create a model:
Plugin Name     Web Dynpro Model Editor Services
Plugin Id     com.sap.ide.webdynpro.service.modeleditor
Class     com.sap.ide.webdynpro.modeleditor.wizards.model.creation.ModelDialog
Method          nextPressed
Message          Internal error - see detail information in exception trace
Exception     org.eclipse.swt.SWTException: Failed to execute runnable (java.lang.NoClassDefFoundError)
Can anybody help?Is there any place in NDS to see the detailed error message?
thanx in advance,
Bhupesh

I modified the xml file as described in the forum.But the error persists.
One interesting thing is:
When I create model after restarting the NDS,I get the following error:
org.eclipse.swt.SWTException: Failed to execute runnable <i>(java.lang.ExceptionInInitializerError: JCO.classInitialize(): Could not load middleware layer 'com.sap.mw.jco.rfc.MiddlewareRFC'
JCO.nativeInit(): Could not initialize dynamic link library librfc. Found version "620.0.1237" but required at least version "620.0.1374".)</i>
I get the NoClassDef found error next time onwards,
Where do I get the 620.0.1374 version of librfc?
thanx.
Bhupesh

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