When I try to call the function grid.mark( ), I get an error message saying "no matching function for call to ‘Dune::SGrid<3, 3, double>::mark(int, refine_mesh(G&) [with G = main(int, char**)::GridType]::ElementLeafIterator&)'<br>
<br>Is it because I have not included the right header file?<br><br>