title: C++ - SiftFeatureDetector is not loading
body: <p>I am currently trying to use OpenCV's SiftFeatureDetector. However, this happens:
  <a href="https://i.stack.imgur.com/aTHSm.png" rel="nofollow noreferrer">Click This Link For Image</a></p>
  
  <p>I saw that I needed the nonfree files. This is where i got my files from:</p>
  
  <p><strong>features2d.hpp:</strong>
  sourceforge.net/p/emgucv/opencv/ci/3ad471d9c187b6509ca4aab439290bc76c7a258f/tree/modules/nonfree/include/opencv2/nonfree/features2d.hpp</p>
  
  <p><strong>nonfree.hpp:</strong>
  sourceforge.net/p/emgucv/opencv/ci/3ad471d9c187b6509ca4aab439290bc76c7a258f/tree/modules/nonfree/include/opencv2/nonfree/nonfree.hpp</p>
  
  <p>These are my imports:
  <a href="https://i.stack.imgur.com/TyOQl.png" rel="nofollow noreferrer">Click This Link For Image</a></p>
  
  <p>Can somebody please tell me what's the problem?</p>