helloi'm working on vertical handover between wimax /wifi i used the MIH module of NIST on NS2.30 ; when i try to change the routing protocole on the wifi-wimax.tcl from DSDV to AODV i got this problem At 5.232206 in 4.0.0 Handover2 received new prefix 3.0.0 old address: 3.0.1, prefix=3.0.0, new address will be 3.0.1ns: [_o179 set ragent_] addr 3.0.1: (_o187 cmd line 1) invoked from within"_o187 cmd addr 3.0.1" invoked from within"catch "$self cmd $args" ret" invoked from within"if [catch "$self cmd $args" ret] {set cls [$self info class]global errorInfoset savedInfo $errorInfoerror "error when calling class $cls: $args" $..." (procedure "_o187" line 2) (SplitObject unknown line 2) invoked from within"[_o179 set ragent_] addr 3.0.1" thanks