<s>[INST] // var videoSource = new cv.Mat();
  var cap = new cv.MatVector();
  cv.merge([dst, dst, dst], videoSource);
  cap.push_back(videoSource);
  videoSource.delete();
  cap.delete();

This is the code to convert a grayscale image to RGB. However, when I try to run it, I get the following error:

OpenCV Error: Assertion failed (scn == 1 && ccn == 1) in cvtColor, file /tmp/opencv-2.4.13.4/opencv-2.4.13.4/modules/imgproc/src/color.cpp, line 3737

What is wrong with the code?[/INST]