I had looged in some comments in some of files like
channel.cc etc.When i executed the script,the statements used to
appear.Butdue to some problems,i deleted existing
nsallinone-2.28 directory and re installed ns2.28 as given in the
website.Now before all path settings are done also if i run ns %
appears.Iam not able to figure out the
problem.Also statement- "When configured, ns found the right version...