openBinaryFile: does not exist (No such file or directory) i386-unknown-linux

I downloaded Edison, and loaded edison-api/src/Data/Edison/Assoc.hs

The directory contains a file called Prelude.hs, which is probably the cause for the compiler's incorrect behaviour.

  / _ \ /\  /\/ __(_)
 / /_\// /_/ / /  | |      GHC Interactive, version 6.6, for Haskell 98.
/ /_\\/ __  / /___| |      http://www.haskell.org/ghc/
\____/\/ /_/\____/|_|      Type :? for help.

Loading package base ... linking ... done.

<interactive>:1:85:
    Bad interface file: Prelude.hi
        Prelude.hi: openBinaryFile: does not exist (No such file or directory)
ghc-6.6: panic! (the 'impossible' happened)
  (GHC version 6.6 for i386-unknown-linux):
        interactiveUI:setBuffering