.str with string

[shendrysu]

hi, I trye to use your code but when I run "zoom_chat_analytics.py start_to_finish cd.txtx example.csv example.pdf" I get this error:
File "C:\Users\User\Anaconda3\lib\site-packages\pandas\core\strings.py", line 1818, in validate
raise AttributeError("Can only use .str accessor with string "
AttributeError: Can only use .str accessor with string values, which use np.object dtype in pandas

How you could help me?