Please help me

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http://www.linuxquestions.org – i tried to run leach-c but I have this errors can't read "env(uAMPS_LIBRARY)": no such variable while executing "source $env(uAMPS_LIBRARY)/ns-leach.tcl" (file "tcl/mobility/leach-c.tcl" line 7) invoked from within "source.orig tcl/mobility/leach-c.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] ...& (HowTos)