I am using the programs, "cbrgen.tcl" and "setdest" provided in NS2 to generate 
 wireless scenarios. However, when I run the "tcl" file using "ns xxxxx.tcl", 
it gave the following error messages. Anyone knows what is wrong with my 

Thanks in advance.

[EMAIL PROTECTED] NS2_programs]$ ns wireless-20.tcl
num_nodes is set 20
warning: Please use -channel as shown in tcl/ex/wireless-mitf.tcl
can't read "topoInstance_": no such variable
    while executing
"$node add-interface $chan $propInstance_ $llType_ $macType_  $ifqType_ 
$ifqlen_ $phyType_ $antType_ $topoInstance_  $inerrProc_ $outerrProc_ $FECProc_"
    (procedure "_o3" line 70)
    (Simulator create-wireless-node line 70)
    invoked from within
"_o3 create-wireless-node"
    ("eval" body line 1)
    invoked from within
"eval $self create-wireless-node $args"
    (procedure "_o3" line 23)
    (Simulator node line 23)
    invoked from within
"$ns_ node"
    ("for" body line 2)
    invoked from within
"for {set i 0} {$i < $val(nn) } {incr i} {
                set node_($i) [$ns_ node]
                $node_($i) random-motion 0              ;# disable random motion
    (file "wireless-20.tcl" line 60)
[EMAIL PROTECTED] NS2_programs]$ 

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