opencv assertion failed (ssize.width >0 && ......) and assertion failed (mv && n >0)

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code:

if (!Img.empty())       {
        std::cout << "can load picture" <<  "\n";
            printf("Img.tpye()= %d Img.channels()=%d", dImg.type(), Img.channels());    
    }
    minMaxLoc(Img,    &minVal, &maxVal, NULL, NULL, Img>0);

1. result: Img.tpye()=5 Img.channels()=1

exception caught: OpenCV(3.4.3) c:\build\3_4_winpack-build-win64-vc15\opencv\mod ules\core\src\minmax.cpp:753: error: (-215:Assertion failed) (cn == 1 && (_mask. empty() || _mask.type() == CV_8U)) || (cn > 1 && _mask.empty() && !minIdx && !ma xIdx) in function 'cv::minMaxIdx'

I first met the assertion fail in the function minMaxLoc , I am sure that there is nothing wrong with my input because I imwrite and check it successfully.

code:

//minMaxLoc(Img,    &minVal, &maxVal, NULL, NULL, Img>0);
minVal = 15.5;
maxVal = 21.5;

OpenCV(3.4.3) Error: Assertion failed (mv && n > 0) in cv::merge, file c:\build \3_4_winpack-build-win64-vc15\opencv\modules\core\src\merge.cpp, line 284

Then I just guess the max and min values of instead of using this function , but another assertion fail happens. I get this project from my classmate, but it works normally in his computer with the same VS2015 and OPENCV 3.4.3

I finally solve this because I use wrong vc lib. My vs version is 2015 but I use vc15 lib library .After changing to vc14 , it works.