unable to start the backend

[niyaz...@gmail.com]

java -jar psimulator2_backend.jar example.xml 

[IMPORTANT] TELNET: TELNET LISTENING PORT: : Device: pc1     listening port: 11000 (pc1)

[IMPORTANT] TELNET: TELNET LISTENING PORT: : Device: cisco2  listening port: 11001 (cisco2)

[IMPORTANT] TELNET: TELNET LISTENING PORT: : Device: linux1  listening port: 11002 (linux1)

[IMPORTANT] TELNET: TELNET LISTENING PORT: : Device: pc2     listening port: 11003 (pc2)

[IMPORTANT] TELNET: TELNET LISTENING PORT: : Device: cisco1  listening port: 11004 (cisco1)

[INFO] NETWORK_MODEL_LOAD_SAVE: config.configTransformer.Loader: XML configuration file is corrupted: 

config.configTransformer.LoaderException: Could not find Device with id=41 a for Switchport with id=44

at config.configTransformer.Loader.findSwitchportFor(Loader.java:458)

at config.configTransformer.Loader.connectCablesV2(Loader.java:409)

at config.configTransformer.Loader.loadFromModel(Loader.java:91)

at psimulator2.Main.main(Main.java:90)

[ERROR] NETWORK_MODEL_LOAD_SAVE: config.configTransformer.Loader: XML configuration file is corrupted. Exiting. config.configTransformer.LoaderException: Could not find Device with id=41 a for Switchport with id=44

I am using the default example ,
psimulator2_2012-05-15

Can anyone help why this is happening ?

[aashray....@vit.ac.in]