OpenCV Error: Assertion failed (!empty()) in detectMultiScale, file /Users/travis/build/skvark/opencv-python/opencv/modules/objdetect/src/cascadedetect.cpp, line 1698 #2
Description
OpenCV Error: Assertion failed (!empty()) in detectMultiScale, file /Users/travis/build/skvark/opencv-python/opencv/modules/objdetect/src/cascadedetect.cpp, line 1698
i do not know how to solve it