I want to import an excel with this code but I get this error

Angular Ag Grid Excel Import

Cannot read properties of undefined (reading '0')

This File import
Can this type of file be imported?

Book.csv

1,chocolate,brown,10
2,gum,red,11
3,juice,yellow,5

I read the app.component.ts file it says that I can import 4 columns.

app.component.ts

    var columns = {
        'A': '',
        'B': 'Make',
        'C': 'Model',
        'D': 'Price'
    };