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Issue in Signing PDF with x509certificate2 Stored In USB Token'

I am trying to add x509 certificate to a pdf file. but every time i try to save the file(loaded document) i get this error (System.OverflowException: 'Array dimensions exceeded supported range.'), please help

GetX509() ' to obtain Cert as x509 Certificate from store under current User
Dim document As New PdfLoadedDocument("a.pdf")
Dim page As PdfLoadedPage = TryCast(document.Pages(0), PdfLoadedPage)

Dim pdfCert As PdfCertificate = New PdfCertificate(cert)
Dim signature As PdfSignature = New PdfSignature(document, page, pdfCert, "Signature")
signature.Reason = "Support X509certificate2"
Dim stream As MemoryStream = New MemoryStream()
document.Save(stream) ' Error: (System.OverflowException: 'Array dimensions exceeded supported range.')
Dim file As FileStream = New FileStream("X509cert.pdf", FileMode.Create, FileAccess.Write)

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