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Unable to create positive samples

I am building a Haar classifier. I have a set of 109 positive samples and 3000 negative samples. To increase my number of positive samples (to say 600), I try using the following command:

opencv_createsamples -vec out.vec -w 24 -h 24 -bg bg.txt -num 600 -info positives.dat

But I get the following error message:

positives.dat(109) : parse errorDone. Created 108 samples

How can I "force" opencv to produce the 600 samples from those 109 I have?