I am a beginner of  ns2, and install the ns-2 version using
ns-allinone-2.29.2.tar.gz , there is gt-itm installed  already in the
ns-2.29

i follow the readme file of the sgb2ns, and calling the create-topology proc
in the ts20.tcl, but failed,could anyone tell me the matter
,thanks a lot!

the process is as following:

creat a test.tcl as the readme file of the sgb2ns:
# ---------------file test.tcl------------------
set ns [new Simulator]
global node_
 source ts20.tcl ;
create-topology ns node_ 1.5Mb
# ----------------------------------------------
and then command:  ns test.tcl

and the excute result is :
creating nodes...
Creating links 0...
    (_o4 cmd line 1)
    invoked from within
"_o4 cmd duplex-link-of-interfaces _o11 _o47 1.5Mb 230ms DropTail"
    invoked from within
"catch "$self cmd $args" ret"
    invoked from within
"if [catch "$self cmd $args" ret] {
set cls [$self info class]
global errorInfo
set savedInfo $errorInfo
error "error when calling class $cls: $args" $..."
    (procedure "_o4" line 2)
    (SplitObject unknown line 2)
    invoked from within
"$ns duplex-link-of-interfaces $n(0) $n(12) $linkBW 230ms DropTail"
    (procedure "create-topology" line 19)
    invoked from within
"create-topology ns node 1.5Mb"
    (file "ts20test.tcl" line 4)

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