An error was encountered while replicating the code

[LuoXianSen123]

Hello, when I reproduced your code, the following problems occurred. May I ask how I can solve them? Please reply.
File "D:\anaconda\envs\senti\lib\site-packages\pandas\core\reshape\concat.py", line 349, in init
raise ValueError("All objects passed were None")
ValueError: All objects passed were None