Network With Maps

Hello everyone

i was just trying to make MultiplayerGame but i got issue with map

i'm not sure how i can explain it because English is not my main language

but i want to make a "Host System without Map" can send RPC To people who are connected in other map

i mean 1 [Host] Server Just in blank Screen With Some Server Option and the players who connected are inside other map

the problem i get is RPC i got some prefix error

i have no idea what prefix is

i tried to follow This :

http://docs.unity3d.com/Documentation/Components/net-NetworkLevelLoad.html

but it didn't help me a lot, also its in Java xD I Need C# one

i have RedTeam Group = 0; and BlueTeam Group = 1;

at this moment i use the "ServerScript" and "ClientScripts" on one map to send RPC and its fine

but also in any new map i put "ServerScript" and "ClientScripts" and i dont need that

i just need a static ServerScript that include Current Map and NextMap then automatically change the Map [only for connected playersnot include the server] when the Match end

sorry for all this long talking i hope you got my point and u can help me, thanks