[ns] Problems with MIP

[ALBERTO FELIPE PEREZ <alberto.felipe@upcnet.es>]

Hi all,
I'm working with ns-allinone-2.1b7a under Linux Red Hat 6.2 and when I try to run "wireless-mip-test.tcl" from ../ns-2.1b7a/tcl/ex I get the next error message:
****************************
[afelipe@watmsBS2 ex]$ ns wireless-mip-test.tcl
num_nodes is set 3
__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 "wireless-mip-test.tcl" line 153)
********************************************

What do I have to do?

Thanks