Tcl code gave error:invalid command name "new" while executing "new Simulator", Tcl

Tcl code gave error:invalid command name "new" while executing "ne...

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Absolute running time: 0.16 sec, cpu time: 0.02 sec, memory peak: 5 Mb, absolute service time: 0,18 sec

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Error(s), warning(s):

invalid command name "new"
    while executing
"new Simulator"
    invoked from within
"set ns [new Simulator]"
    (file "2027470982/source.tcl" line 6)

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