[Python] "TypeError: object of type 'NoneType' has no len()" while using fillpdfs

I'm currently trying to create a program that allows me to auto-fill a pdf file using python and fillpdfs.

This is the code so far:

from fillpdf import fillpdfs

form_fields = list(fillpdfs.get_form_fields('R7 Form - template.pdf').keys())

name = 'TEST'
furigana = 'テスト'

birth_jp = '昭和'
birth_year = '7'
birth_month = '7'
birth_day = '7'

data_dict = {
form_fields[7]: name,
form_fields[5]: furigana,
form_fields[10]: birth_year,
form_fields[11]: birth_month,
form_fields[12]: birth_day,
form_fields[9]: birth_jp
}

fillpdfs.write_fillable_pdf('R7 Form - template.pdf', 'test.pdf', data_dict)


I've tried cross-referencing it with things I'm seeing on the internet, and it looks fine. But it always throws the error. I'm not sure where I'm going wrong and what I need to be doing instead.

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