DebugUtilsMessenger linking error, informs of doubly

[JPLost]

For some reason the validation layers give error code from the example code. Removing the validation layer code compiles correctly.
Vulkan version 1.4.304.1 and glfw 3-4. Apparently symbols are not unique. Visual Studio 2022

[JPLost]

Yeah, my bad. If I separate the class and main to different files, of course it would need class declaration in header file.