编译失败

windows10 64位，Android studio。
配置好了opencv路径。

Information:Gradle tasks [assemble]
F:\hyperlpr4Android-master\app\src\main\jni\src\PlateDetection.cpp
Error:(30) undefined reference to 'cv::CascadeClassifier::detectMultiScale(cv::_InputArray const&, std::ndk1::vector<cv::Rect, std::ndk1::allocator<cv::Rect > >&, double, int, int, cv::Size, cv::Size)'
Error:error: undefined reference to 'vtable for std::basic_stringstream<char, std::char_traits, std::allocator >'
Error:error: undefined reference to 'std::string::append(unsigned int, char)'
Error:error: undefined reference to 'std::ostream::operator<<(short)'
Error:undefined reference to 'std::length_error::length_error(std::string const&)'
Error:error: undefined reference to 'std::invalid_argument::invalid_argument(std::string const&)'
Error:error: linker command failed with exit code 1 (use -v to see invocation)
F:\hyperlpr4Android-master\app\src\main\jni\src\Pipeline.cpp
Warning:(25, 9) warning: delete called on 'pr::GeneralRecognizer' that is abstract but has non-virtual destructor [-Wdelete-non-virtual-dtor]
Warning:(25, 9) warning: delete called on 'pr::GeneralRecognizer' that is abstract but has non-virtual destructor [-Wdelete-non-virtual-dtor]
Information:BUILD FAILED in 19s
Information:7 errors
Information:2 warnings
Information:See complete output in console