Wanning :Cannot merge Cells

Question

I’m having trouble in a form generation system, when it passes a certain appears

Warning: Cannot merge Cells - top left and bottom right incorrectly specified

Range r = s.mergeCells(1, 0, total, 0); //<---quando passa dessa linha aparece o erro

Label alunos = new Label(1, 0, "QUANTIDADE DE ALUNOS", cf); 
s.addCell(alunos);

Label nome= new Label(total + 1, 0, "nome", cf);

s.addCell(nome);

s.mergeCells(total + 1, 0, total + 10, 0);

Label tabulacao = new Label(0, 0, "ASPECTOS", cf);

s.addCell(tabulacao);