Starting Simulation...
ns: _o17 start-dsdv: 
    (_o17 cmd line 1)
    invoked from within
"_o17 cmd start-dsdv"
    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 "_o17" line 2)
    (SplitObject unknown line 2)
    invoked from within
"_o17 start-dsdv"

where should i start looking for the problem source?
please advice, very urgent.
                                          

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