Chat problem

Hi,

I want to integrate a chat in my game, most function don't existe.
For test, i have keep the gui and script of stronghold exemple in my game (chatHud.gui, ChatHud.cs, messageHud.cs).
When i run my server game, the chat run very good.
But when a client join the game -> crash (error, particles not found)
I'm sure this error is the cause of chat.

In the server-chat i can see (player1 join the game)
I think that message client->server is OK, but server->client KO.

I have check stonghold source but i don't find why :(

Somebody can help me (i have surly forgotte a line)

Thanks for your help ;)