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How to solve the error "Expression:vector subscript out of range" when using train_classifierNM2.cpp

I was trying to run the train_classifierNM2.cpp to train my own data, when run into the function StatModel::train<boost>(cvml, Boost::Params(Boost::REAL, 100, 0.0, 1, false,Mat())), it appeared the error image description

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here is how