HI : I still cannot run any wireless simulation ,and how to analyse simulation ?I downloaded a simple script from the internet ran and got the errors like : ouldn't read file "../lib/ns-bsnode.tcl": no such file or directory while executing "source.orig ../lib/ns-bsnode.tcl" ("uplevel" body line 1) invoked from within "uplevel source.orig [list $fileName]" invoked from within "if [$instance_ is_http_url $fileName] { set buffer [$instance_ read_url $fileName] uplevel eval $buffer } else { uplevel source.orig [list $fileName] ..." (procedure "source" line 8) invoked from within "source ../lib/ns-bsnode.tcl" (file "umairwireless.tcl" line 19 what should I do ?