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whats the meaning of following errors in opencv2.4.5 undefined reference to cv::CascadeClassifier::CascadeClassifier()' undefined reference tocv::CascadeClassifier::load(std::string const&)' undefined reference to `cv::CascadeClassifier::detectMultiScale(cv::Mat const&, std::vector<cv::rect_<int>, std::allocator<cv::rect_<int> > >&, double, int, int, cv::Size_<int>, cv::Size_<int>)'

thanks in advance!!!!

whats the meaning of following errors in opencv2.4.5 opencv2.4.5

undefined reference to cv::CascadeClassifier::CascadeClassifier()'
`cv::CascadeClassifier::CascadeClassifier()'
undefined reference tocv::CascadeClassifier::load(std::string to `cv::CascadeClassifier::load(std::string const&)'
undefined reference to `cv::CascadeClassifier::detectMultiScale(cv::Mat const&, std::vector<cv::rect_<int>, std::allocator<cv::rect_<int> std::vector<cv::Rect_<int>, std::allocator<cv::Rect_<int> > >&, double, int, int, cv::Size_<int>, cv::Size_<int>)'
cv::Size_<int>)'

thanks in advance!!!!