[ns] Error while executing!

[shravan vallala <svallala@eng.utoledo.edu>]

 When I execute the first tutorial example
  
************************************************************************
   I get a message saying
 
  "cannot connect to existing nam instance.
Starting a new one..."
************************************************************************

  but it opens nam window. Is it ok or will it create some problems. I
just want to be sure that I installed NS perfectly. 

thanx for your help
shravan