[ns] problems with MIP

["Piercarlo Venditti" <pievendi@tin.it>]

Hello everybody.
I'm writing again about the same concern since I want to explain a little
bit better what I did.
 I wrote:
>
>Hello to everyone,   I  don' t know how to create a mobilehost that would
be moving   >between HA and FA .
 >I tried writing: set MH [$ns_ node 1 .0.0]
>                     set node_(0)  $MH
>                     set HAaddress [AddrParams set-hieraddr [$HA
node-addr]]
>                     [$MH set regagent_] set home_agent_  $HAaddress
>but I don' t understand why it is not right
>thanh  you for your help.

I forgot to tell that I simply operated a "cut and paste" from the the Marc
Greis's  tutorial about "Creating Wired-cum-Wireless and Mobile IP
Simulations in ns", example wireless3.tcl.
When I run the simulator (NS2.1b7 version) I got this message:
"...FAILED_SHADOW_OBJECT_
    while executing
"error "__FAILED_SHADOW_OBJECT_" """
    (procedure "set-hieraddr" line 4)
    (SplitObject init line 4)
    invoked from within
"set-hieraddr init 1.0.0"
    (Class create line 1)
    invoked from within
"AddrParams create set-hieraddr 1.0.0"
    ("eval" body line 1)
    invoked from within
"eval [list $self] create [list $m] $args         "
    (procedure "AddrParams" line 5)
    (Class unknown line 5)
    invoked from within
"AddrParams set-hieraddr [$HA node-addr]"
    invoked from within
"set HAaddress [AddrParams set-hieraddr [$HA node-addr]]"
    (file "wireless3.tcl" line 143)....................................."

Then I'd like to know if there is a bug in this example or if I miss some
other instructions or whether the version I use is not proper to simulate
wireless environments.
I'd like to thank in  advance anyone who will be so kind to help me.Sorry
first I send  an incomplite  version of my question.
Carlo