Do you know what that means?

Question

#include "RGBImage.h"

the code is in the coding of 3d graphics, is it correctly written like that?
and what is the meaning of that code?

because when I run the program, there is an error in that section

Answer 1

It is some custom header of unknown origin, searching on Google may tell that it is most likely from some code sample (that you might have deployed in its incomplete form). Regardless, if the header does not exist, you cannot include it. "RGBImage.h" is a dependency and is supposed to be somewhere in your project folder.