[ns] Add new Queue Error

[IFFAT AHMED]

Dear ALL,
   
   I am new to NS2
  Want to run DTRR example from NS BY EXAMPLE
   
  but, i get error about:
      Queue/DTRR
      intserv
        qtype
   
   
  plz help me. Am I missing any step to add new queue. I have followed
each n every step presented in NS by EXAMPLE tutorial
   
   
   
  Regards,
  Iffat