[ns] getting queue limit prob

[waqar haq]

hi to all
m trying to get a queue limit using this code

set queue [[$ns_ link $node $nbr] set queue_]
        set queueli [$queue queue_in_bytes_]
        puts "queuuelimit $queueli"



i have used simple drop tail queue
after getting handle of queue from link
i tried to use queue_in_bytes as its bind with tcl i have checked in
droptail class in c++
but its was not working , it says

set savedInfo $errorInfo
error "error when calling class $cls: $args" $..."
    (procedure "_o46" line 2)
    (SplitObject unknown line 2)
    invoked from within
"$queue queue_in_bytes_"


help me out plzzzzzzzzzz