Unity 5.0.0f4 - Problem in compiler with attributes

Beginner Questions
#1

When importing the asset on unity, console shows this 2 errors in the compiler:

1:
Shader error in ‘Hidden/AstarPathfindingProject/Navmesh’: undeclared identifier ‘UnityObjectToClipPos’ at line 53 (on d3d9)

Compiling Vertex program

2:
Assets/AstarPathfindingProject/Core/astarclasses.cs(13,41):
error CS0246: The type or namespace name `Attribute’ could not be found. Are you missing a using directive or an assembly reference?

I’ve tried older versions of the project but it doesn’t seem to be compatible because of old Api’s or the same “attribute” issue. ¿Help?

#2

Hi

The package is supported from Unity 2017.4 and up. You can take a look at this page for some older versions (check the changelog to see when support is dropped): https://www.arongranberg.com/astar/download