[ns] error statement

[manishsingh chaudhary]

hi
to all
 their was an error in following statement:-

num_nodes is set 4
*warning:* Please use -channel as shown in tcl/ex/wireless-mitf.tcl
INITIALIZE THE LIST xListHead

    (_o3 cmd line 1)
    invoked from within
"_o3 cmd runs"
    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" $..."
    (procedure "_o3" line 2)
    (SplitObject unknown line 2)
    invoked from within
"$ns runs"
    (file "wireless1.tcl" line 147)