NotImplementedException: The requested feature is not implemented.

I am using the latest AssimpNet 3.1.1, and Unity3d. And I am getting the following error when loading a fbx file:

NotImplementedException: The requested feature is not implemented. System.Runtime.InteropServices.Marshal.GetHRForLastWin32Error () (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Runtime.InteropServices/Marshal.cs:412) Assimp.Unmanaged.AssimpLibraryWindowsImplementation.NativeLoadLibrary (System.String path) Assimp.Unmanaged.AssimpLibraryImplementation.LoadAssimpLibrary (System.String path) Assimp.Unmanaged.AssimpLibrary.LoadLibrary () Assimp.Unmanaged.AssimpLibrary.LoadIfNotLoaded () Assimp.Unmanaged.AssimpLibrary.CreatePropertyStore () Assimp.AssimpContext.CreateConfigs () Assimp.AssimpContext.PrepareImport () Assimp.AssimpContext.ImportFile (System.String file, PostProcessSteps postProcessFlags) Loaded.Start () (at Assets/Scripts/Loaded.cs:26)

Below is the C# script:

using System.Collections; using System.Collections.Generic; using UnityEngine; using System.IO; using Assimp; using Assimp.Configs;

public class Loaded : MonoBehaviour {

public string filepath = @"D:/DynamicLoadPOC/10001.fbx"; private Scene m_model;

// Use this for initialization void Start () {

string filename = Path.GetFileName (filepath);
string rootpath = Path.GetDirectoryName (filepath);

Assimp.AssimpContext import = new Assimp.AssimpContext ();

// MeshVertexLimitConfig m = new MeshVertexLimitConfig (65000); // import.SetConfig (m); Assimp.PostProcessSteps flags = (Assimp.PostProcessSteps.OptimizeMeshes | Assimp.PostProcessSteps.OptimizeGraph | Assimp.PostProcessSteps.SortByPrimitiveType | Assimp.PostProcessSteps.SplitLargeMeshes | Assimp.PostProcessSteps.Triangulate);

m_model = import.ImportFile (rootpath + "/" + filename, flags);

if (m_model == null) {
    Debug.Log ("cannot read file");
} else {
    Debug.Log (m_model.MeshCount + "mesh count");
}

} }

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