XLSB เป็น CSV พร้อมแพนด้า python

import os

import pandas as pd

path = r'C://Users//greencolor//Autoreport//Load_attachments//'
for filename in os.listdir(path):
    if filename.startswith("PB orders"):
        print(filename)                         #until here its working
        month = pd.read_excel(filename, sheet_name="Raw data ", engine="pyxlsb")
        print(month)                            # I get the error here
        month = month[month['Sales Manager'] == 'DEVON, JOHN'] #filtering by manager
        month.to_csv (path + filename + ".csv", index = None, header=True)
import os
...
for filename in os.listdir(path):
    if filename.startswith("PB orders"):
        full_path = os.path.join(path, filename)
        print(full_path )                         
        month = pd.read_excel(full_path , sheet_name="Raw data ", engine="pyxlsb")