Ошибка в opencv_traincascade

В чем может быть ошибка?

 C:\Users\Ilya>opencv_traincascade.exe -data C:\Users\Ilya\Desktop\samples\haarcascade -vec C:\Users\Ilya\Desktop\samples\samples.vec -bg C:\Users\Ilya\Desktop\Haar\Bad\Bad.dat -numStages 16 -minHitRate 0.999 -maxFalseAlarmRate 0.4 -numPos 990 -numNeg 1000 -w 20 -h 20 -mode ALL -precalcValBufSize 1024 -precalcIdxBufSize 1024
    PARAMETERS:
    cascadeDirName: C:\Users\Ilya\Desktop\samples\haarcascade
    vecFileName: C:\Users\Ilya\Desktop\samples\samples.vec
    bgFileName: C:\Users\Ilya\Desktop\Haar\Bad\Bad.dat
    numPos: 990
    numNeg: 1000
    numStages: 16
    precalcValBufSize[Mb] : 2048
    precalcIdxBufSize[Mb] : 2048
    acceptanceRatioBreakValue : -1
    stageType: BOOST
    featureType: HAAR
    sampleWidth: 20
    sampleHeight: 20
    boostType: GAB
    minHitRate: 0.999
    maxFalseAlarmRate: 0.4
    weightTrimRate: 0.95
    maxDepth: 1
    maxWeakCount: 100
    mode: ALL
    Number of unique features given windowSize [20,20] : 125199

    ===== TRAINING 0-stage =====
    <BEGIN
    POS count : consumed   990 : 990
    Train dataset for temp stage can not be filled. Branch training terminated.
    Cascade classifier can't be trained. Check the used training parameters.