diff --git a/Arrowgene.Ddon.Server/Handler/FallbackHandler.cs b/Arrowgene.Ddon.Server/Handler/FallbackHandler.cs
index 1d81a35f9..2e33c94e3 100644
--- a/Arrowgene.Ddon.Server/Handler/FallbackHandler.cs
+++ b/Arrowgene.Ddon.Server/Handler/FallbackHandler.cs
@@ -24,7 +24,7 @@ public override void Handle(TClient client, IPacket request)
             {
                 PacketId responsePacketId = PacketId.GetPacketId(Server.Type, request.Id.GroupId, request.Id.HandlerId, 2);
                 IBuffer responseBuffer = new StreamBuffer();
-                responseBuffer.WriteUInt32((uint) ErrorCode.ERROR_CODE_FAIL, Endianness.Big);
+                responseBuffer.WriteUInt32((uint) ErrorCode.ERROR_CODE_NOT_IMPLEMENTED, Endianness.Big);
                 Packet response = new Packet(responsePacketId, responseBuffer.GetAllBytes());
                 client.Send(response);
             }
diff --git a/Arrowgene.Ddon.Shared/Model/ErrorCode.cs b/Arrowgene.Ddon.Shared/Model/ErrorCode.cs
index 804a6eaa2..420b3e7c3 100644
--- a/Arrowgene.Ddon.Shared/Model/ErrorCode.cs
+++ b/Arrowgene.Ddon.Shared/Model/ErrorCode.cs
@@ -4,6 +4,7 @@ public enum ErrorCode : uint
 {
     ERROR_CODE_SUCCESS = 0x0,
     ERROR_CODE_FAIL = 0x1, // TODO Custom Error Code, find real one
+    ERROR_CODE_NOT_IMPLEMENTED = 0x2,
     ERROR_CODE_DB_DUPLICATE_ENTRY = 0x3E8,
     ERROR_CODE_DB_DEAD_LOCK = 0x3E9,
     ERROR_CODE_DB_FAILURE = 0x3EA,