PyPDF2.errors.DeprecationError: PdfFileWriter is deprecated and was removed in PyPDF2 3.0.0. Use PdfWriter instead.

This error message indicates that the PdfFileWriter class in PyPDF2 is no longer supported and has been removed in version 3.0.0. Instead, you should use the PdfWriter class.

To fix this error, you need to update your code to use the new PdfWriter class. Here is an example of how to create a PDF file using the PdfWriter class:

from PyPDF2 import PdfFileReader, PdfWriter

# create a new PdfWriter object
writer = PdfWriter()

# add a new page to the PDF
page = writer.add_blank_page(width=612, height=792)

# write some text on the page
page.add_text("Hello, World!")

# save the PDF to a file
with open("output.pdf", "wb") as out:
    writer.write(out)

Note that you may need to modify your existing code to use the new PdfWriter class, depending on what you are trying to do.