大家好，我是一个python新手，刚入门，想写一个获取微信群成员头像的代码，课是调试时总出弦如下错误，还求大家指点。谢谢大家。
错误：

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我的代码：
#!/usr/bin/env python3
# -*- coding: utf-8 -*-

from wxpy import *
import threading
import os
import time

class wechatInfo (object):
    # 初始化微信
    def __init__ (self):
        self.bot = Bot()
        self.myself = self.bot.self
        self.friends = self.bot.friends()
        # self.tuling = Tuling(api_key='ad68c7fe6caf4d29bb78fe36cbbf1b63')

    def main (self):
        if not os.path.exists('./info/' + wechat.myself.name):
            filepath = os.getcwd()
            os.makedirs(filepath + '/info/' + wechat.myself.name + '/headImg')
            self.getGroupsList()

    # 获取群列表
    def getGroupsList (self):
        groups = self.bot.groups()
        print(groups)
        for i in range(len(groups)):
            group = groups[i]
            for f in range(len(group.members)):
                if f == 0:
                    writeType = 'w'
                else:
                    writeType = 'a'

                t = threading.Thread(target=self.saveHeadImg, args=(group.members[f],))
                t.start()

    # 保存头像
    def saveHeadImg (groups, member):
        print('正在保存 %s 的头像...' % member.name)
        groups.get_avatar('info/%s/headImg/%s_%s.jpg' % (self.myself.name, member.name[:20], time.time()))


    # def reply_msg(self, msg):
    #     self.tuling(msg)

if __name__ == "__main__":
    wechat = wechatInfo()
    wechat.main()