Cannot retrieve prev. msg

[i8890321]

Here's the output in my cmd window

C:\Users\abc\Portable_Python-3.8.6_x64\App\Python>python poe_retrievemsg.py
Traceback (most recent call last):
File "poe_retrievemsg.py", line 31, in
previous_messages = client.get_previous_messages('a2', chatId=123456789, count=2)
File "C:\Users\abc\Portable_Python-3.8.6_x64\App\Python\lib\site-packages\poe_api_wrapper\api.py", line 1000, in get_previous_messages
chatdata = response_json['data']['node']
TypeError: 'NoneType' object is not subscriptable