This version of Unity is unsupported.

AssetDatabase.CopyAsset

public static bool CopyAsset(string path, string newPath);

Parameters

pathFilesystem path of the source asset.
newPathFilesystem path of the new asset to create.

Description

Duplicates the asset at path and stores it at newPath.

All paths are relative to the project folder, for example: "Assets/MyTextures/hello.png".