[Haskell-cafe] Some help needed to start Haskell with Yi

Hi there I'm new to Haskell and need some help to get started faster (busy busy busy). I like to adjust and extend an editor to my liking and I choose Yi. Only installation with 'cabal install yi' in a Cygwin shell under MS Windows XP ended in: Yi\Prelude.hs:182:9: Duplicate instance declarations: instance Category Accessor.T -- Defined at Yi\Prelude.hs:182:9-38 instance Category Accessor.T -- Defined in data-accessor-0.2.1:Data.Accessor.Private cabal.exe: Error: some packages failed to install: yi-0.6.1 failed during the building phase. The exception was: exit: ExitFailure 1 :( Seems easy to fix but I can't even find where on my drive I can find the source code. Where is the source? Cheers, Jaco