I use the code from the example https://docs.opencv.org/master/d9/dd8/samples_2cpp_2stitching_detailed_8cpp-example.html I send such code to the command line
Project1.exe stitching_detailed IMG_20190208_144746.jpg IMG_20190208_144732.jpg —warp cylindrical
I get the answer
Finding features...
Unknown 2D features type: 'surf'.
Please tell me how to solve this problem.