KeyError problem

Hello, I’m new to DLS but I’m trying to use my own dataset for an LSTM based model.
I’ve followed the video and created the train.csv, having two columns with the text already tokenized separated by ; and the second column with the categories.
The software keeps on giving me the error on the first column when I try to define the model, adding the input part.

What am I doing wrongly?

Thank you


Hi is the array is of same length for every row?