参数index类型错误, 必须为整数类型

想提取微信聊天记录最后一条信息的文本内容，一直提示

 参数index类型错误, 必须为整数类型
Traceback (most recent call last):
File "D:\Program Files (x86)\ShadowBot\shadowbot-5.8.18\python\lib\runpy.py", line 193, in _run_module_as_main
"__main__", mod_spec)
File "D:\Program Files (x86)\ShadowBot\shadowbot-5.8.18\python\lib\runpy.py", line 85, in _run_code
exec(code, run_globals)
File "D:\Program Files (x86)\ShadowBot\shadowbot-5.8.18\python\lib\site-packages\xbot_interpreter.py", line 67, in <module>
main()
File "D:\Program Files (x86)\ShadowBot\shadowbot-5.8.18\python\lib\site-packages\xbot_interpreter.py", line 45, in main
try:
File "C:\Users\Administrator\AppData\Local\ShadowBot\users\d8f5b617-d6dd-4f1e-8cee-0f59c3a6657e\apps\de76d29c-dadf-434a-a05a-2dd1b3144b02\xbot_robot\main.py", line 11, in main
element_instance = xbot_visual.list.get_elem(lst=win_element_list, index=win_element_list[-1], _block=("main", 3, "获取列表指定位置项"))
File "<string>", line 79, in wrapper
File "<string>", line 74, in wrapper
File "<string>", line 202, in get_elem
File "<string>", line 35, in parseint_from_args
ValueError: 参数index类型错误, 必须为整数类型

参数index类型错误, 必须为整数类型