[ns] ping protocol

[juan manuel gomez garcia]

hello,
I make the ping protocol of Marc Greis' tutorial but when I change the 
'ns-default.tcl' , I obtain the next error when I run any tcl scrip

/ns-allinone-2.29/ns-2.29/tcl/ex/$ ns wireless.tcl
ns:
[code omitted because of length]
: invalid command name "Agent/Ping"
    while executing
"Agent/Ping set packetSize_ 64"


Please help me. Thank you.

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