read_plist bad command @conflicts problems with pkg_add

[Farid Yavari]

   Hello, PLEASE HELP..
    I am getting the folllowing when doing pkg_add on my FreeBSD 4.8
   system.
   pkg_info: read_plist bad command '@conflicts acroread-3.*'
   After doing research it seems like I need an upgraded version of pkg_
   command sets. My question is where and how do I upgrade the commands
   so this problem goes away?

   Thanks
   Farid
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References

   1. http://g.msn.com/8HMAENUS/2740??PS=