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[ns] what's error ???



Dear Master
I am a beginner in NS2 .
My study is infrastructure wireless network ,so I excute the example
"wired-cum-wireless-sim.tcl"
but it always show me the message as follows
can you tell me what's error 

[root@whale ex]# ns wired-cum-wireless-sim.tcl
num_nodes is set 3
Starting Simulation...
MAC_802_11: accessing MAC cache_ array out of range (src 4, dst 0, size 3)!
MAC_802_11: accessing MAC cache_ array out of range (src 4, dst 0, size 3)!
MAC_802_11: accessing MAC cache_ array out of range (src 4, dst 0, size 3)!
MAC_802_11: accessing MAC cache_ array out of range (src 4, dst 0, size 3)!
MAC_802_11: accessing MAC cache_ array out of range (src 4, dst 0, size 3)!
MAC_802_11: accessing MAC cache_ array out of range (src 4, dst 0, size 3)!
MAC_802_11: accessing MAC cache_ array out of range (src 4, dst 0, size 3)!
MAC_802_11: accessing MAC cache_ array out of range (src 4, dst 0, size 3)!
MAC_802_11: accessing MAC cache_ array out of range (src 4, dst 0, size 3)!
MAC_802_11: accessing MAC cache_ array out of range (src 4, dst 0, size 3)!
[suppressing a