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[ns] validation test failure ---->test-all-red



hi ,
       i am a final year computer science engineering student. I am doing a project that
involves network simulator.I am using ns-2.1b6. when i ran the  validation test, only a specific test called " test-all-red" failed. Can anybody help me out with this. i am using ns on
linux platform.
I am getting  an error message
 " nam: no $display environment assigned" , when
  i run  "ns ex1.tcl". ex1.tcl is a demo program that
i got from a tutorial.
       please help me out of this . its very
  urgent!!!!!
                                                     bye!!!