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I am getting this error: OpenCV Error: Assertation failed <samples.type&lt;&gt;cv_32f ||="" samples.type&lt;&gt;cv_32s=""> in cv::ml::TrainDataImpl::setData

I have extracted feature and placed it in a String;

String features = "352111653512146120635735005";

Mat m;
    m.push_back(features);
    m.reshape(1, 1);

    freeman.push_back(m);
             labelMat.push_back(label);

             Ptr<ml::KNearest> knn = ml::KNearest::create();
        Ptr<ml::TrainData> td = ml::TrainData::create(feature, ml::ROW_SAMPLE, label);  <-----I am getting error here

I am getting this error: OpenCV Error: Assertation failed <samples.type&lt;&gt;cv_32f ||="" samples.type&lt;&gt;cv_32s=""> in cv::ml::TrainDataImpl::setData

I have extracted feature and placed it in a String;

//for loop

String features = "352111653512146120635735005";

Mat m;
    m.push_back(features);
    m.reshape(1, 1);

    freeman.push_back(m);
             labelMat.push_back(label);

             Ptr<ml::KNearest> knn = ml::KNearest::create();
        Ptr<ml::TrainData> td = ml::TrainData::create(feature, ml::ROW_SAMPLE, label);  <-----I am getting error here

I am getting this error: error:

OpenCV Error: Assertation failed <samples.type&lt;&gt;cv_32f ||="" samples.type&lt;&gt;cv_32s=""> <samples.type<>CV_32F || samples.type<>CV_32S> in cv::ml::TrainDataImpl::setData
cv::ml::TrainDataImpl::setData

I have extracted feature and placed it in a String;

//for loop

String features = "352111653512146120635735005";

Mat m;
    m.push_back(features);
    m.reshape(1, 1);

    freeman.push_back(m);
             labelMat.push_back(label);

             Ptr<ml::KNearest> knn = ml::KNearest::create();
        Ptr<ml::TrainData> td = ml::TrainData::create(feature, ml::ROW_SAMPLE, label);  <-----I am getting error here