Very simple : No nam file has been created. See lines 144, 145 :
#set namtrace [open mih.nam w]
#$ns namtrace-all-wireless $namtrace $opt(x) $opt(y)
Just edit line 180 to :
# exec nam mih.nam &
... Then you won't get any messages about any ***.nam
It's easy to trace in the file, just use the 'grep' command for reading :
$ grep -n mih.nam umts.tcl
144:#set namtrace [open mih.nam w]
180:exec nam mih.nam &
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