[Solved] undefined reference to ‘cv::xfeatures2d::SIFT::create(…)’

xfeatures2d::SIFT::create() Error

This line below report an error:

Ptr<cv::Feature2D> detector1 = xfeatures2d::SIFT::create(128);
Error Messages:
Solution: Remove xfeatures2d::

    //Ptr<cv::Feature2D> detector1 = xfeatures2d::SIFT::create(128);
    Ptr<cv::Feature2D> detector1 = SIFT::create(128);