Adding TextBoxField to a pdf with python

[gcarream2sc]

I'm trying to add a TextBoxField to a pdf using this instruction:

doc = PdfDocument()
page = doc.Pages.Add() # add an empty page
page.Canvas.DrawString("TextBox:", font, brush1, PointF(10.0, baseY))
tbxBounds = RectangleF(baseX, baseY, 350.0, 15.0)
textBox = PdfTextBoxField(page, "name")
textBox.Bounds = tbxBounds
textBox.Font = font
doc.Form.Fields.Add(textBox)

and it works fine but if i try to add the same TextBoxField to a page of an existing pdf i get the excpetion "AttributeError: 'NoneType' object has no attribute 'Fields'", below the code i'm using:
infile = "/path/inputfile.pdf"
doc = PdfDocument()
doc.LoadFromFile(inputFile)
page = doc.Pages[0]
page.Canvas.DrawString("TextBox:", font, brush1, PointF(10.0, baseY))
tbxBounds = RectangleF(baseX, baseY, 350.0, 15.0)
textBox = PdfTextBoxField(page, "name")
textBox.Bounds = tbxBounds
textBox.Font = font
doc.Form.Fields.Add(textBox)

What's wrong?
thank you

[Doris.Liu]

Hi,

Thanks for inquiry and sorry to reply late for weekend.
I tested with Spire.PDF for Python 10.5.2 and did not have the problem you described. If you are not testing with 10.5.2, please update to 10.5.2 to test as the new version will contain more fixes. If you still have problems, please provide your system environment (e.g. Windows 10) and send your test file to 'support@e-iceblue.com' and we will investigate further. Thanks in advance for your assistance!

Sincerely,
Doris
E-iceblue support team