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Nx exception "No geometry for copied datums definition"

Hello all,

While instatiating the udf, i am getting this error. Nxopen.Nxexception: No geometry for copied datum's definition. 

 

theUFsession.Modl.CreateInstantiatedUdf(udffeattag, cgmName, parents, newParents, lnumparents, lexp, new_exp, lnumexp, new_udf)

 

What is the source of this error...

 

thanks,

bala