Exception thrown at 0x00007FFFE5728E6C in Demo.exe: Microsoft C++ exception: cv::Exception at memory location 0x000000D971A6F210. [closed]

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I am trying OpenCV 4 with Visual Studio 17 on Windows 8, testing for some simple codes as below:

Mat dst, cdst;
Canny(src, dst, 50, 200, 3); 
cvtColor(dst, cdst, COLOR_GRAY2BGR);

Libraries: opencv_world401.lib;opencv_world401d.lib

Please advise me for the above error, I checked all path & dependencies in configuration. Please help me!