I can't access the classes with "using Pathfinding;"

I am working on a top down 2D game in Unity with Visual Studio Code and I want to use A* Pathfinding for the enemies. The pathfinding works and it looks fun, however I want to do some coding. When I add the “using Pathfinding;” it is displayed a but darker and I can’t access Classes like Seeker and Path.
namespace Pathfinding {…} also doesn’t work.

Any reason for it? Thanks in advance.

SOLVED it has been fixed by ticking the “Embedded packages” and “Local Packages” checkbox and regenerate project files

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Solution for me : Unable to access Using Pathfinding; - #20 by waltermandelbrot