[FIXED - Solution added]Trying to recompile a mod, getting several errors

[Niami]

I'm trying to recompile an old mod so I can update and customise it (KSPlogiRGB).

I've downloaded it, opened it in VS2019 and added all the assembly references but there are still errors in the error list:

The name 'KSPAddon' does not exist in the current context

The type or namespace name 'KSP' could not be found (are you missing a using directive or assembly reference?)

 

Although those errors show in the list there are no actual errors in the code (no red lines) and I don't know what to do now.

 

 

Edit : I figured out what's wrong but I don't want to delete in case anyone else has the same issues.

Make sure your project is using the correct .Net Framework version (Project > Properties > Application - for Visual Studio Users). For KSP 1.9 you must use .Net Framework 4.5

Edited February 18, 2020 by Niami
Improved solution