hi @lauro.teles
I can’t run this code on my computer because I don’t have the Atualizado 09.2023 excel sheet. That’s why @AnnMarieW suggested you read my post on how to share a minimal reproducible example.
We either need to get your code to fully execute so we can replicate your error, or we start clean by working off a sample data set (px.data.iris(), px.data.gapminder(), etc.) and try to achieve the same result you’re looking for.
You’re trying to use the callback to select a specific column from the dataframe and sum up the numbers of that column? Did I get that right?