Dear Kyusik,
 

> /user2/hanks318/dealii/dealii_pre/examples/step-20/step-20.cc:575: error: 
> no matching function for call to 
> ‘project_boundary_values(dealii::DoFHandler<2, 2>&, dealii::ZeroFunction<2, 
> double>, dealii::QGauss<1>&, std::map<unsigned int, double, 
> std::less<unsigned int>, std::allocator<std::pair<const unsigned int, 
> double> > >&, dealii::ComponentMask&)’
>

I think that the problem is that for the VectorTools:: 
project_boundary_values 
<https://www.dealii.org/8.4.1/doxygen/deal.II/namespaceVectorTools.html#a0c684536027758309d42a546d8e6ca48>
 function 
the argument that specifies the function to be projected is not a Function 
itself, but rather a FunctionMap 
<https://www.dealii.org/8.4.1/doxygen/deal.II/structFunctionMap.html>. 
You'll notice that this is necessary because you no longer specify the 
boundary id for the Dirichlet Function to be applied to as a parameter to 
the projection function.

I hope that this helps you solve the issue.

Regards,
Jean-Paul

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