Asterisk Java

Hello,

I have a problem now in working with Asterisk Java, i am working with Asterisk 1.6 in Hello Manager Example
asterisk-java.org/development/tutorial.html but there is an error which appears to me each time
Terminating reader thread: No more lines available: null
org.asteriskjava.manager.internal.ManagerConnectionImpl disconnect
Closing socket.
please help me .
Thanks