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[ns] about wired-cum-wireless-sim script in ns-allinone-2.1b8a



dear all,
i've tried to run example script (wired-cum-wireless-sim.tcl)
in ns directory (ns-allinone-2.1b8a running on linux redhat).
there are some messages appear like below:
 
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 additional MAC cache_ warnings]
NS EXITING....
 
Can anyone tell me what does it mean?
regards,
dade