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#include "opencv/highgui.h"
or
#include "opencv2/highgui/highgui.hpp"
depending on you using the c or c++ interface in opencv , may be your mixing the interface or anything related to this in your code , it can be better figure out if you upload sample code. You should try using your code with one of the above libraries. From here we can check out that highgui - an easy-to-use interface to video capturing, image and video codecs, as well as simple UI capabilities. Check your code from where you use these functionalities , check if your mixing interface there or not , if not then check your code with one the above libraries , if it not solved then post your sample code here