insert edges in faces- CGAL error: assertion violation - c++

Question

I'm creating an application using qt creator which read .off files as CGAL::Linear_cell_complex_for_combinatorial_map and preview it I want to make operations on the read mesh such as removing edge and restore it .
it shows the following error :
terminate called after throwing an instance of 'CGAL::Assertion_exception'
what(): CGAL ERROR: assertion violation!
Expr: is_insertable_cell_1_in_cell_2(adart1, adart2)
I searched about it but I cannot get an useful solution
QWidget* viewer ;
std::string filename;
Dart_handle dh3;
LCC_3 lcc;
QMainWindow qWin;
CGAL::DefaultColorFunctorLCC fcolor;
void MainWindow ::insertCell()
{
dh3=lcc.insert_cell_1_in_cell_2(lcc.darts().begin(), lcc.darts().end());
CGAL_assertion( lcc.is_valid() );
lcc.display_characteristics(std::cout) << ", valid=" <<
lcc.is_valid() << std::endl;
setCentralWidget( new CGAL::SimpleLCCViewerQt<LCC_3, CGAL::DefaultColorFunctorLCC>(&qWin ,
lcc,
"Basic LCC Viewer",
false,
fcolor ) );
show();
}
void MainWindow ::removeCell()
{
CGAL_assertion( (lcc.is_removable<2>(dh3)) );
lcc.remove_cell<1>(dh3);
CGAL_assertion( lcc.is_valid() );
lcc.display_characteristics(std::cout) << ", valid="
<< lcc.is_valid() << std::endl;
}
any help? or usefull links to simplify mesh or removing vertices , edges or faces ?
I appreciate any help

Answer 1

To insert an edge in a face, cf the doc here. For a face in a volume, the doc is there. You can also have a look at the example here.
The important thing to understand is when you add an edge into a face, you need to say where to insert the edge. This is the reason why you give two precise darts. This is similar when you want to insert a face into a volume: you need to give a sequence of darts which is a cycle of edges in the volume.