Exception : - Chaning own data (option under Employee Search) in ESS

Hi Experts

I am getting this exception

com.sap.tc.webdynpro.services.exceptions.WDRuntimeException: failed to create or init instance of model 'com.sap.xss.hr.cod.model.CodModel' in scope APPLICATION_SCOPE with instanceId 'null'

in ESS Employee search (changing own data)

Pls provide your inputs

Thanks

Rishi.