Ns problem

Hello everyone:
     I feel quiet sorry for my trouble for you.
     when I do "ns reconnect.tcl",the reconnect.tcl is sample in the tcl folder.It have a problem like this"
    (_o10 cmd line 1)
    invoked from within
"_o10 cmd get-bgp-agent"
    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" $..."
    (procedure "_o10" line 2)
    (SplitObject unknown line 2)
    invoked from within
"$n0 get-bgp-agent"
    invoked from within
"set bgp_agent0 [$n0 get-bgp-agent]"
    (file "reconnect.tcl" line 27)

"
could you help me solve this problem,thank you in advance?
                                                                     Guiqin Yuan