Hi,

The line that is causing the error is

const typename DoFHandler<dim>::active_cell_iterator neighbor = 
cell->neighbor(face_no)


after the first refinement of the grid.  Its called in the structure:

if (cell->at_boundary(face_no))
{
}
else
{
   const typename DoFHandler<dim>::active_cell_iterator neighbor = 
cell->neighbor(face_no);
}

I don't really understand what the message "ExcAssignmentOfInactiveObject()" 
means, and how I should go about solving this error.  I hope that makes sense.  
Do let me know if you require further information.

Many thanks,

Katie
________________________________________
From: Wolfgang Bangerth [[email protected]]
Sent: 04 July 2011 18:12
To: [email protected]
Cc: Katie Leonard; Markus Bürg
Subject: Re: [deal.II] Adding spatial adaptivity to Step-21

> 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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