I've resolved the issue by adding a fragment of code that handles sparsity
pattern.
DoFRenumbering::Cuthill_McKee (dof_handler);
hanging_node_constraints.clear();
DoFTools::make_hanging_node_constraints(dof_handler,
hanging_node_constraints);
hanging_node_constraints.close();
DynamicSparsityPattern dsp(dof_handler.n_dofs(), dof_handler.n_dofs());
DoFTools::make_sparsity_pattern(dof_handler, dsp);
hanging_node_constraints.condense(dsp);
sparsity_pattern.copy_from(dsp);
stiffness_matrix.reinit(sparsity_pattern);
mass_matrix.reinit(sparsity_pattern);
--
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