Third Party Photon Serialization Error!!

Hello, when trying to serialize my Vector3i class in photon, I still get the error, Exception: cannot serialize(): Vector3i. Any Tips?

Here's what i do to serialize it :

Code (CSharp):

1. using ExitGames.Client.Photon;
2.  
3. void Start()
4. {
5. PhotonPeer.RegisterType(typeof(Vector3i), (byte)'V', SerializeVector3, DeserializeVector3);
6. }  
7. public static readonly byte[] memVector3 = new byte[3 * 4];
8.  
9. private static short SerializeVector3(StreamBuffer outStream, object customobject){
10.         Vector3i vo = (Vector3i)customobject;
11.  
12.         int index = 0;
13.         lock (memVector3)
14.         {
15.             byte[] bytes = memVector3;
16.             Protocol.Serialize(vo.x, bytes, ref index);
17.             Protocol.Serialize(vo.y, bytes, ref index);
18.             Protocol.Serialize(vo.z, bytes, ref index);
19.             outStream.Write(bytes, 0, 3 * 4);
20.         }
21.  
22.         return 3 * 4;
23.     }
24.  
25. private static object DeserializeVector3(StreamBuffer inStream, short length)
26.     {
27.         Vector3i vo = new Vector3i();
28.         lock (memVector3)
29.         {
30.             inStream.Read(memVector3, 0, 3 * 4);
31.             int index = 0;
32.             Protocol.Deserialize(out vo.x, memVector3, ref index);
33.             Protocol.Deserialize(out vo.y, memVector3, ref index);
34.             Protocol.Deserialize(out vo.z, memVector3, ref index);
35.         }
36.  
37.         return vo;
38.     }

ANY HELP WILL BE GREATLY APPRECIATED!!