用pyPDF2合并PDF时报错unicodeencodeerror:'atin-1' codec can't encode characters in pisition 8-9

import PyPDF2
import os
folder = os.getcwd()
pdffiles = []
for file in os.listdir(folder):
if file.endswith('.pdf'):
pdffiles.append(file)
merger = PyPDF2.PdfFileMerger()
for file in pdffiles:
merger.append(PyPDF2.PdfFileReader(file))
merger.write('拼合后的PDF.pdf')