I guess uwe should put this example file with server docs.
This error is often made so newbies admins refuses to install custom maps.
This kind of information is very important and should be highlighted in the server configuration. …
I've never created an ns2 server but,
on every server i've connected with custom maps, i must download all maps.
If i want to add 100 maps on a server this is going too heavy and nobody gonna connect on the server.