This version of Unity is unsupported.
Removed

ShaderIncludePathAttribute

class in UnityEditor

/

Implemented in:UnityEditor

Obsolete

Description

This attribute is no longer supported.

Shader libraries in arbitrary locations are no longer supported. Your shader files must be located under the Assets folder or in a package. To include shader headers from packages, use the following syntax in the shader code:
#include "Packages/<package name>/<path to your header file>"