Jaekwang, 

[...]
>
>     VectorTools::integrate_difference 
> (dof_handler,solution,Solution<dim>(),
>
>                                        difference_per_cell
> *,QGauss<dim>(degree+**2**)*,VectorTools::L2_norm);
>
somegthing that immediately comes to mind is that you don't use a 
non-default Mapping in here although your boundary is curved.
Make sure that you use an appropriate Mapping everywhere!

Best,
Daniel

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