[ns] Help Creat Wireless Node Urgent

[Question NS]

Hi, 

I just suffered a problem in NS2.26 to creat a
wireless node, I actualy run
tcl/ex/simple-wireless.tcl and wireless-mitf.tcl, but
failed, it shows:

num_nodes is set 2

    (_o15 cmd line 1)
    invoked from within
"_o15 cmd add-interface _o12 _o14 LL Mac/802_11
Queue/DropTail/PriQueue 50 Phy/WirelessPhy
Antenna/OmniAntenna {} {} {}"
    invoked from within
"catch "$self cmd $args" ret"
    (procedure "_o15" line 2)
    (SplitObject unknown line 2)
    invoked from within
"$node add-interface $chan $propInstance_ $llType_
$macType_  $ifqType_ $ifqlen_ $phyType_ $antType_ 
$inerrProc_ $outerrProc_ $FECProc_"
    (procedure "_o3" line 64)
    (Simulator create-wireless-node line 64)
    invoked from within
"_o3 create-wireless-node"
    ("eval" body line 1)
    invoked from within
"eval $self create-wireless-node $args"
    (procedure "_o3" line 14)
    (Simulator node line 14)
    invoked from within
"$ns_ node"
    invoked from within
"set node_(0) [$ns_ node]"
    (file "./wireless-mitf.tcl" line 110)
-------------------------------------------------
num_nodes is set 2
warning: Please use -channel as shown in
tcl/ex/wireless-mitf.tcl

    (_o14 cmd line 1)
    invoked from within
"_o14 cmd add-interface _o13 _o12 LL Mac/802_11e
Queue/DropTail/PriQueue 50 Phy/WirelessPhy
Antenna/OmniAntenna {} {} {}"
    invoked from within
"catch "$self cmd $args" ret"
    (procedure "_o14" line 2)
    (SplitObject unknown line 2)
    invoked from within
"$node add-interface $chan $propInstance_ $llType_
$macType_  $ifqType_ $ifqlen_ $phyType_ $antType_ 
$inerrProc_ $outerrProc_ $FECProc_"
    (procedure "_o3" line 64)
    (Simulator create-wireless-node line 64)
    invoked from within
"_o3 create-wireless-node"
    ("eval" body line 1)
    invoked from within
"eval $self create-wireless-node $args"
    (procedure "_o3" line 14)
    (Simulator node line 14)
    invoked from within
"$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 "./simple-wireless.tcl" line 93)

Anyone if can help, I would very appreciated!

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