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Taking a look at the current knnMatch documentation I guess the matcher interface was changed.

It seems that since 2.4.10 you need to use the pointer interface. Something like this should work

Ptr<BFMatcher> matcher(NORM_L2, true); 
Mat mask;
matcher -> knnMatch(descriptors_1, descriptors_2, matches, 2, mask, false);  // Find two nearest matches

Can you check the result?

Taking a look at the current knnMatch documentation I guess the matcher interface was changed.

It seems that since 2.4.10 you need to use the pointer interface. Something like this should work

Ptr<BFMatcher> matcher(NORM_L2, true); Ptr<DescriptorMatcher> matcher;  matcher->create("BruteForce");
Mat mask;
matcher -> knnMatch(descriptors_1, descriptors_2, matches, 2, mask, false);  // Find two nearest matches

Can you check the result?