[Tutor] A question about daunting KeyError

[TAISHI KAWAMURA]

Hi tutors on Tutor,

I'm Taishi from Japan working in a data analytics team.

Currently, I'm trying to analyse purchase data of a fashion brand.
However, mysterious KeyErrors started occurring continuously when I was coding, and I haven't been able to get that fixed.

Although I asked this question on Stack Over Flow and another platform, I haven't got any solution.

I'm suspecting that Anaconda might keep raising the error, or simply there are bugs in the codes.
However, I can't be sure what the real cause is.

Do you think you can help me out?
If yes, please give me some assistance.

Regards,
Taishi Kawamura