[ns] error when calling class $cls: $args" $...

[Aso Amedyan]

Dear all,
I am trying to run an ns2 test program for QoS over MPLS and I have used 5 nodes.
I have encountered the following errors. I will be glad if anyone helps me to fix the errors.

******** Error  message***************

    (_o3 cmd line 1)
    invoked from within
"_o3 cmd configure-ldp-on-all-mpls-nodes"
    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 configure-ldp-on-all-mpls-nodes"
    (file "QoS-over-MPLS.tcl" line 158)


Sincerely
Aso
aso.amedyan at ntnu.no