Problem loading .obj runtime

I save my gameobject on disk using http://wiki.unity3d.com/index.php?title=ExportOBJ.

all is good - Blender opens nicely.

I load from disk using http://wiki.unity3d.com/index.php?title=ObjImporter

Loaded object looks like broken or empty

I am struggling with it for a week now. I have googled and tried but nothing works. I think I am missing something simple here.

 ObjImporter oi = new ObjImporter ();
         objToSpawn = new GameObject("TAG_0");
         //Add Components
         objToSpawn.transform.parent = o.transform;
         objToSpawn.AddComponent<MeshFilter>();
         objToSpawn.AddComponent<MeshRenderer>();
         var asd = oi.ImportFile (filepath);
         objToSpawn.GetComponent<MeshFilter> ().mesh = asd;
         objToSpawn.AddComponent<MeshCollider>().mesh = asd;
 
     //http://docs.unity3d.com/ScriptReference/Mesh-uv.html
         Vector3[] vertices = objToSpawn.GetComponent<MeshFilter>().mesh.vertices;
         Vector2[] uvs = new Vector2[vertices.Length];
         int i = 0;
         while (i < uvs.Length) {
             uvs[i] = new Vector2(vertices[i].x, vertices[i].z);
             i++;
         }
         objToSpawn.GetComponent<MeshFilter>().mesh.uv = uvs;
 
         objToSpawn.GetComponent<MeshFilter> ().mesh.RecalculateNormals();
         objToSpawn.GetComponent<MeshFilter> ().mesh.RecalculateBounds ();
 
         GameObject primitive = GameObject.CreatePrimitive(PrimitiveType.Plane);
         primitive.active = false;
         Material diffuse = primitive.GetComponent<MeshRenderer>().sharedMaterial;
         DestroyImmediate(primitive);
 
         //fix diffuse
         objToSpawn.renderer.sharedMaterial = diffuse;
         objToSpawn.renderer.material.color = Color.red;

thank in advance fro anykind of help