Have an error when using OpenCV

[cansik]

Still, write more information:

• Which library? (there are two opencv libraries for processing)
• Which example?
• Where do you run it on? (windows / mac / linux)
• What have you already tried to fix it? (Have you even read the stacktrace?)

Please check out the guidelines for asking questions:

Guidelines—Asking Questions

Summary (TL;DR) Ask complete questions to get better answers! Be specific. For example: I want to load an image. I tried using createImg() , and I expected the image to be on canvas, but what happened instead was the image showing up below the canvas. Isolate your problem and work in small steps. Share only the code directly related to your problem if it is part of a bigger project, and if something isn’t working, try the smallest code that could do the thing you want. Can we run your code …