Hi

I am practicing the tutorials examples of Deal.ii. In step-9, which
deals with the advection equation and shows the use of refinement
meshing, I am trying to use a different mesh, generated with Gmsh (I
attach the file). 

        if (cycle == 0)
          {
            //      GridGenerator::hyper_cube (triangulation, -1, 1);
            //      triangulation.refine_global (4);

            GridIn<dim> grid_in;
            grid_in.attach_triangulation (triangulation);
            std::ifstream input_file ("square.msh");
            grid_in.read_msh (input_file);
          }
        else
          {
            refine_grid ();
          };


The domain is the same and no other modifications were made. After 3
cycles the program gives me an error about convergence:


Cycle 0:
   Number of active cells:       416
   Number of degrees of freedom: 453
Cycle 1:
   Number of active cells:       1043
   Number of degrees of freedom: 1204
Cycle 2:
   Number of active cells:       2657
   Number of degrees of freedom: 3077


----------------------------------------------------
Exception on processing: 
Iterative method reported convergence failure in step 1000 with residual
3.12503e-07
Aborting!
----------------------------------------------------


I have no idea why I'm receiving this error. Can you give me any
suggestions?

Best Regards
Javier Muñoz


$NOD
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$ENDNOD
$ELM
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$ENDELM
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