> I took the refinement code from step-31.

That isn't enough for us to see what exactly you are doing.

In general, does the following entry in the FAQ help?
  
http://dealii.sourceforge.net/index.php/Deal.II_Questions_and_Answers#deal.II_aborts_my_program_with_an_error_message

W.

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Wolfgang Bangerth                email:            [email protected]
                                 www: http://www.math.tamu.edu/~bangerth/
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