Dispatcher: WRQ mm NetAscii from /192.168.0.254:48019
Dispatcher: Forwarding request packet to localhost/127.0.0.1:6900
Server->Client[48019]: ERROR 6 'File already exists : "mm"'
Session: Found server address /127.0.0.1:49359
Server->Client[48019]: That was the last packet, finishing.
Session: Received ERROR, forcing Client->Server to finish.
Client->Server[49359]: That was the last packet, finishing.
Session: Both relays finished, closing sockets.
Session: Both relays finished, closing sockets.
Exception in thread "Thread-3" java.lang.NullPointerException
        at errorsim.Session.onFinished(Session.java:169)
        at errorsim.Relay.run(Relay.java:122)
        at java.lang.Thread.run(Thread.java:619)