[45º tan]

i don`t know why

Exception:
System.Net.Sockets.SocketException: Only one usage of each socket address (protocol/network address/port)
is normally permitted
   at System.Net.Sockets.Socket.DoBind(EndPoint endPointSnapshot, SocketAddress socketAddress)
   at System.Net.Sockets.Socket.Bind(EndPoint localEP)
   at System.Net.Sockets.TcpListener.Start(Int32 backlog)
   at System.Net.Sockets.TcpListener.Start()
   at System.Runtime.Remoting.Channels.ExclusiveTcpListener.Start(Boolean exclusiveAddressUse)
   at System.Runtime.Remoting.Channels.Tcp.TcpServerChannel.StartListening(Object data)
   at System.Runtime.Remoting.Channels.Tcp.TcpServerChannel.SetupChannel()
   at System.Runtime.Remoting.Channels.Tcp.TcpServerChannel..ctor(Int32 port)
   at System.Runtime.Remoting.Channels.Tcp.TcpChannel..ctor(Int32 port)
   at Server.Engines.OrbRemoteServer.OrbServer.Run(Object o)
   at System.Threading._ThreadPoolWaitCallback.WaitCallback_Context(Object state)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Threading._ThreadPoolWaitCallback.PerformWaitCallback(Object state)

any idea?