Flex - Spring - BlazeDC

Hello!!
I`m develop little example with Adobe tutorial: http://www.adobe.com/devnet/livecycle/articles/blazeds_spring_05.html
Deploy is Done!!!! But when applicattion started I had error by celling RPC:
[FaultEvent fault=[RPC Fault faultString="Send failed" faultCode="Client.Error.MessageSend" faultDetail="Channel.Connect.Failed error NetConnection.Call.Failed: HTTP: Failed: url: 'http://localhost:8400/messagebroker/amf'" messageId="88205208-79EC-E149-2FE7-24D288A04302" type="fault" bubbles=false cancelable=true eventPhase=2]

What is the error?