#6 StartIndex cannot be less than zero.\r\nParameter name: star

[Anonymous]

I get this error with the follow setences: (what's
wrong?
pdfDocument librosPdf = new pdfDocument
("Informe de libros", "mcascalesg");
pdfPage pagina = librosPdf.addPage();
pagina.addText("Informe de libros", 100,
100, predefinedFont.csCourierBoldOblique, 16);

pdfTable tabla = new pdfTable();

tabla.borderSize = 2;
tabla.borderColor =
predefinedColor.csBlack;

tabla.tableHeader.addColumn(new
pdfTableColumn("Autor", predefinedAlignment.csCenter,
30));
tabla.tableHeader.addColumn(new
pdfTableColumn("Titulo", predefinedAlignment.csCenter,
30));
tabla.tableHeader.addColumn(new
pdfTableColumn("Precio (EUR)",
predefinedAlignment.csCenter, 10));
tabla.tableHeader.addColumn(new
pdfTableColumn("Stock", predefinedAlignment.csCenter,
8));
tabla.tableHeader.addColumn(new
pdfTableColumn("Fecha", predefinedAlignment.csCenter,
10));

fila = tabla.createRow();
fila[0].columnValue = "Prueba";
fila[1].columnValue = "Prueba";
fila[2].columnValue = "30.33";
fila[3].columnValue = "4";
fila[4].columnValue = "23/04/2006";
tabla.addRow(fila);

tabla.tableHeaderStyle = new
pdfTableRowStyle(predefinedFont.csCourierBoldOblique,
12, predefinedColor.csBlack,
predefinedColor.csLightCyan);
tabla.rowStyle = new pdfTableRowStyle
(predefinedFont.csCourier, 8,
predefinedColor.csBlack,predefinedColor.csWhite);
tabla.alternateRowStyle = new
pdfTableRowStyle(predefinedFont.csCourier,
8,predefinedColor.csBlack,
predefinedColor.csLightYellow);
tabla.cellpadding = 20;

pagina.addTable(tabla, 100,100);
tabla = null;
pdfPageMarker paginaMaker = new
pdfPageMarker(500, 30, predefinedMarkerStyle.csArabic);
paginaMaker.fontColor =
predefinedColor.csDarkPurple;
paginaMaker.fontSize = 12;
paginaMaker.fontType =
predefinedFont.csTimes;
paginaMaker.pattern = "Página #n#/#N#";
librosPdf.pageMarker = paginaMaker;

librosPdf.createPDF("libros.pdf");

thanks in advance.