Problem with Haar Cascade Training [closed]

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I'm following the tutorial for a haar cascade training (https://docs.opencv.org/3.4.1/dc/d88/...). I'm trying to execute the createsamples.cpp from opencv_createsamples, but I always get this error:‘class cv::AutoBuffer<short int="">’ has no member named ‘data’, does anyone have an idea of what problem could be?</short>

I've looked here https://docs.opencv.org/3.1.0/d8/dd0/..., and actually there's no public member named data, should I replace "data" with which member?

Thanks in advance!