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the file is probably encoded with something other than utf-8 You could try https://github.com/chardet/chardet

Hello @visch! Thanks for the answer! It’s weird because it’s encoded on UTF-8. Also always fails in the same row (in the row 100k) BUT if i start from there, it works fine another 100k rows or even more. It is possible to be a memory issue (like a buffer issue or something like that?) Because if i reduce the file size it’s working properly

it's possible of course but if it happens consistently I would think something else 🤷