cvtColor assertion failed ( OpenCV with C++ )

Question

I have a

cv::Mat image;

object, which I loaded an image to from a file, it reads it correctly and all.

Now I have written a functio

Answer 1

Try image.clone() for coping images

Answer 2

if(!image.empty()) {
    //your_code
} else
    std::cout<<"Emty "

check the matrix before you convert.

Answer 3

Try using different dst image:

cv::Mat grayImage;
cv::cvtColor(image, grayImage, CV_RGB2GRAY);