报错UnicodeEncodeError: 'mbcs' codec can't encode characters in position 0--1: invalid character

line 39: shuju.to_csv( 'D:/DBYP.csv',index=True, header=h, mode='a', encoding='ANSI')

报错：UnicodeEncodeError: 'mbcs' codec can't encode characters in position 0--1: invalid character
想问大家这个为什么会这样啊，不知道如何解决，希望大家帮帮忙，感谢！