[ns] error while adding new protocol from "NS by example"

[paolomj@libero.it]

Hi all!

I'va a problem when I try to add the Multimedia agent and protocol from "NS by example (nile.wpi.edu/NS/index.html)". I followed all the steps, but when I try to run the script I get:

invalid command name "Agent/UDP/UDPmm"
    while executing
"Agent/UDP/UDPmm create _o132 "
    invoked from within
"catch "$className create $o $args" msg"
    invoked from within
"if [catch "$className create $o $args" msg] {
if [string match "__FAILED_SHADOW_OBJECT_" $msg] {
delete $o
return ""
}
global errorInfo
error "class $..."
    (procedure "new" line 3)
    invoked from within
"new Agent/UDP/UDPmm"
    invoked from within
"set udp_s [new Agent/UDP/UDPmm]"
    (file "ex-mm-app.tcl" line 69)


Do you have any solution/idea?

Thank you very much!
Regards,

                     Paolo Carpo