Thank you for providing additional info. I have reproduced the error with Aspose.Pdf 3.5.3 for .NET 2.0. The error occurs in Aspose.PDF assembly. Here is a stack trace:
System.NullReferenceException: Object reference not set to an instance of an object.
at Aspose.Pdf.Xml.ᛋ.ၵ(ո , String ֎, Single ֺ, Int32 ـ, Single )
at Aspose.Pdf.Xml.ᚧ.ᚨ(Pdf , Section ၞ, Table ࢎ, Row ག, Cell ཚ, Text փ, String ֎, ࿏ , ჴ ტ)
at Aspose.Pdf.Xml..(Pdf , Section ၞ, Heading ֏, Table ࢎ, Row ག, Cell ཚ, ࿏ , Boolean უ)
at Aspose.Pdf.Xml.Ⴀ.Ⴂ(Pdf , Section ӕ, ࿏ )
at Aspose.Pdf.Xml.ڊ.ၼ(Pdf )
at Aspose.Pdf.Xml.ှ.၃(ո Ք, Pdf )
at Aspose.Pdf.Pdf.Save(String pdfFile)
I am transferring this thread to Aspose.Pdf forum. They will contact you shortly on the matter.
Best regards,
Vladimir Averkin
Developer/Technical Support
Aspose Auckland Team