How to fix exception on: cimg(cv::Mat)

Question

I'm developing an emotion detecting software using C++ and opencv library.

When the execution reaches this line:

cv_image<bgr_pixel> cimg(original);

there is a VisualStudio exeption:

Unhandled exception at 0x00007FFC54F9A839 in Emotion.exe: Microsoft C ++ exception: dlib :: fatal error at memory location 0x00000064B36F7270.

See the entire function:

CvCapture* cap = cvCaptureFromAVI("sample.avi");
IplImage* frame2;
cv::Mat original;
while(1)
{
    frame2 = cvQueryFrame(cap);
    cv::Mat frame = cv::cvarrToMat(frame2);
    original = frame.clone();
    cv_image<bgr_pixel> cimg(original); //exception here
    ...
}

I suppose that problem is caused by original.