opencv traincascade error w.r.t. vector subscripts

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Hi all, I am getting a Debug assertion failed while using traincascade application in debug mode. The error is not in traincascade application but in vector The error simply reads-

Line: 932

Expression: vector subscript out of range

When I run the code in release mode, I just get a windows error. This is not because of bad images and I have not given the same number of files in npos as my total positive images. Has anyone faced this issue?