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You're not linking with required library. You need to check that which mode your using debug or release . opencv_core242d.lib is use for debug mode , and for release you need to use the same without d like opencv_core242.lib

For example

#ifdef DEBUG
 #pragma comment (lib , "opencv_core242d.lib")
#else
 #pragma comment (lib , "opencv_core242.lib")
#endif

You're not linking with required library. You need to check that which mode your using debug or release . opencv_core242d.lib is use for debug mode , and for release you need to use the same without d like opencv_core242.lib

For example

#ifdef DEBUG
 #pragma comment (lib , "opencv_core242d.lib")
#else
 #pragma comment (lib , "opencv_core242.lib")
#endif