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I'm trying to make a Haar Feature-based Cascade Classifier using opencv_traincascade. But I have had this message.

PS C:\cascade2\TrainingData> opencv_traincascade -data .\result\ -vec positive.vec -bg .\negative.txt -numPos 4500 -numNeg 2355 -f HAAR -mode ALL

PARAMETERS:

cascadeDirName: .\result\

vecFileName: positive.vec (positive.vec is made of 5000 JPEG files created by create_samples and one JPEG file.)

bgFileName: .\negative.txt

numPos: 4500

numNeg: 2355

numStages: 20

precalcValBufSize[Mb] : 256

precalcIdxBufSize[Mb] : 256

stageType: BOOST

featureType: HAAR

sampleWidth: 24

sampleHeight: 24

boostType: GAB

minHitRate: 0.995

maxFalseAlarmRate: 0.5

weightTrimRate: 0.95

maxTreeDepth: 1

maxWeakCount: 100

mode: BASIC

Stages 0-9 are loaded

===== TRAINING 10-stage =====

BEGIN

Train dataset for temp stage can not be filled. Branch training terminated.

This attempt is the second time. When I tried it for the first time, Anything goes from stage0 to stage9. But I received the same error on stage10. What should I do?