OpenCV Error: Assertion failed

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Hi, I tried to create my first Haarcascade, I followed along a tutorial but now I get this error when I try to train the cascade:

C:\HaarCascade>C:\HaarCascade\Haartraining\build\x64\vc10\bin\opencv_traincascade.exe -data classifier-vec samples.vec -bg NegativesNew.txt -numStages 10 -miniHitRate 0.999 -maxFalseAlarmRate 0.5 -numPos 7 -numNeg 890 -w 60 -h 35 -mode ALL -precalcValBufSize 256 -precalcIdxBufSize 256 Training parameters are loaded from the parameter file in data folder! Please empty the data folder if you want to use your own set of parameters. PARAMETERS: cascadeDirName: classifier vecFileName: samples.vec bgFileName: NegativesNew.txt numPos: 7 numNeg: 890 numStages: 10 precalcValBufSize[Mb] : 256 precalcIdxBufSize[Mb] : 256 stageType: BOOST featureType: HAAR sampleWidth: 60 sampleHeight: 35 boostType: GAB minHitRate: 0.995 maxFalseAlarmRate: 0.5 weightTrimRate: 0.95 maxDepth: 1 maxWeakCount: 100 mode: ALL

===== TRAINING 0-stage ===== <begin opencv="" error:="" assertion="" failed="" (_img.rows="" *="" _img.cols="=" vecsize)="" in="" cvcascadeimagereader::posreader::get,="" file="" ........\opencv\apps\traincascade\imagestorage.cpp,="" line="" 157<="" p="">

I start training the cascade by this command:

C:\HaarCascade\Haartraining\build\x64\vc10\bin\opencv_traincascade.exe -data classifier-vec samples.vec -bg NegativesNew.txt -numStages 10 -miniHitRate 0.999 -maxFalseAlarmRate 0.5 -numPos 7 -numNeg 890 -w 60 -h 35 -mode ALL -precalcValBufSize 256 -precalcIdxBufSize 256

Anyone knows why I get this error

Thanks

Paul