Classes are not recognized (from external library)

Hello everyone.
I’ve seen the following tutorial about Using external libraries

I’ve added --net-lib libs/new/MathNet.Numerics.dll in my hxml file.
then when I do “haxe build.hxml” there is no error.
but on my Main.hx file, classes of my dll are not recognized.
I’ve tried to import the classes in Main.hx, but they are not recognized bu VSCODE

did I ask a rude question?! :thinking:

What does “not recognized” mean? What Haxe code are you compiling and what errors are you getting from the compiler?