If I copy the "lcds" folder, Tomcat starts with socket errors

In the documentation it is said that when you create a new server-side application, you can start by copying the 'webapps/lcds' folder. I did that but then, Tomcat starts with some socket errors:

[LCDS]SocketServer 'my-rtmp-SocketServer' failed to pre-validate desired socket settings for BindSocketAddress: 0.0.0.0:2038

java.net.SocketException: Unrecognized Windows Sockets error: 0: JVM_Bind

[LCDS]SocketServer 'my-rtmp-SocketServer' failed to start.

flex.messaging.LocalizedException: SocketServer 'my-rtmp-SocketServer' cannot bind to accept client connections on port '2038' because another process has already bound the port. Please ensure that multiple endpoints across all applications  are not configured to use this same port.

Am I doing something wrong?

Thanks,

Borek