ne ha 2 cell1 + altre 9 non è corretto?

l'errore che mi becco è:

Exception in thread "main" java.lang.NullPointerException
at com.lowagie.text.pdf.PdfPTable.getRowHeight(Unknow n Source)
at com.lowagie.text.pdf.PdfPTable.calculateHeights(Un known Source)
at com.lowagie.text.pdf.PdfPTable.setTotalWidth(Unkno wn Source)
at com.lowagie.text.pdf.ColumnText.goComposite(Unknow n Source)
at com.lowagie.text.pdf.ColumnText.go(Unknown Source)
at com.lowagie.text.pdf.ColumnText.go(Unknown Source)