installing hack2-handler-snap-server

error.txt

squid:web seanhess$ cabal update
Downloading the latest package list from hackage.haskell.org
squid:web seanhess$ cabal install hack2-handler-snap-server
Resolving dependencies...
Configuring hack2-handler-snap-server-2011.10.12...
Preprocessing library hack2-handler-snap-server-2011.10.12...
Building hack2-handler-snap-server-2011.10.12...
[1 of 1] Compiling Hack2.Handler.SnapServer ( src/Hack2/Handler/SnapServer.hs, dist/build/Hack2/Handler/SnapServer.o )

src/Hack2/Handler/SnapServer.hs:72:55:
    Couldn't match expected type `Snap.Headers'
                with actual type `Data.Map.Map k0 a0'
    Expected type: Snap.Headers -> a1
      Actual type: Data.Map.Map k0 a0 -> [(k0, a0)]
    In the second argument of `(.)', namely `toAscList'
    In the first argument of `(.)', namely
      `request . SnapInternal.rqHeaders . toAscList'

src/Hack2/Handler/SnapServer.hs:104:112:
    Couldn't match expected type `Snap.Headers'
                with actual type `Data.Map.Map
                                    (CaseInsensitive.CI ByteString) (m0 ByteString)'
    Expected type: [(CaseInsensitive.CI ByteString, m0 ByteString)]
                   -> Snap.Headers
      Actual type: [(CaseInsensitive.CI ByteString, m0 ByteString)]
                   -> Data.Map.Map (CaseInsensitive.CI ByteString) (m0 ByteString)
    In the second argument of `(.)', namely `fromAscList'
    In the `SnapInternal.rspHeaders' field of a record
cabal: Error: some packages failed to install:
hack2-handler-snap-server-2011.10.12 failed during the building phase. The
exception was:
ExitFailure 1
squid:web seanhess$