xfeatures2d::SIFT::create()报错

Ptr detector1 = xfeatures2d::SIFT::create(128);这行代码报错

报错信息：

 解决办法：去掉 xfeatures2d::

    //Ptr detector1 = xfeatures2d::SIFT::create(128);
    Ptr detector1 = SIFT::create(128);