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什么是未定义的参考/未解决的外部符号错误？什么是常见原因以及如何修复/预防它们？

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当我尝试运行示例find_obj.cpp或任何OpenCV SURF程序时,我在执行代码时在命令提示符中收到以下错误.该项目的构建没有错误和警告.我正在使用VS2011 beta,OpenCV 2.4和windows7.

错误信息:

OpenCV Error: The function/feature is not implemented < OpenCV was built without SURF support> in unknown function,file ..\..\..\src\opencv\modules\legacy\src\features2d.cpp, line 77

我尝试在调试模式下使用Cmake然后再使用VS2011再次构建OpenCV 2.4,然后在IDE中添加了lib路径,但仍然没有结果.

我该如何解决这个问题？

    #include <opencv2/objdetect/objdetect.hpp>
    #include <opencv2/features2d/features2d.hpp>
    #include <opencv2/core/core.hpp>
    #include <opencv2/highgui/highgui.hpp>
    #include <opencv2/legacy/legacy.hpp>
    #include <opencv2/legacy/compat.hpp>
    #include <opencv2/flann/flann.hpp>
    #include <opencv2/calib3d/calib3d.hpp>
    #include <opencv2/nonfree/features2d.hpp>
    #include <opencv2/nonfree/nonfree.hpp>

using namespace std;
using namespace cv;
int main()
{
    cv::initModule_nonfree();//THIS LINE IS IMPORTANT   

   IplImage *image1 = cvLoadImage("C:\\SURF\\1.jpg"); 
    IplImage *image2 = cvLoadImage("C:\\SURF\\2.jpg");

    CvMemStorage* memoryBlock = cvCreateMemStorage();
    CvSeq* image1KeyPoints;
    CvSeq* image1Descriptors;
    CvSeq* …