[plt-scheme] PLT Redex w/ 301.13

I'm running DrScheme version 301.13-svn9may2006 on Linux, because 
the latest legit release crashes on startup.

When I put 

  (require (planet "[file]" ("robby" "redex.plt" 2 2)))

in my program, I get the message:

  open-input-file: cannot open input file: 
   "/home/steck/.plt-scheme/planet/300/301.13/cache/robby/redex.plt/2/2/[file]"
   (No such file or directory; errno=2)

What do I need to do to get the PLaneT package to load?

-- Paul