Mobile sctp and MW node (multiple interfaces)

Hi all!
I am trying to simulate handover between UMTS/WLAN using sctp. I use ns2.33. I try to modify the standard sctp code to implement the add-ip, delete-ip procedures and I use the MW node patch: http://www.q2s.ntnu.no/~paquerea/ns.php to use multiple interfaces. I installed the patch but there was an error and when i run my tcl script it shows error as:
(_o3 cmd line 1)
invoked from within
“_o3 cmd wireless-config -routing DSDV -mac Mac/802_11 -phy Phy/WirelessPhy -channel _o12 -propagation Propagation/TwoRayGround -topography _o10 -ll LL…”
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_ wireless-config -routing $val(rp)
-mac $val(mac)
-phy $val(n…”
(file “sctpq2s.tcl” line 37)

Does anyone know what may be wrong?
Has anyone worked on the same subject (sctp for heterogenous handover)? Is there another way from MW node?

Thanks in advance