[Haskell-beginners] Why am I having such weird dependency issues?

Neither of these errors makes any sense to me. What's happening? $ cabal update Downloading the latest package list from hackage.haskell.org $ cabal install yi Resolving dependencies... cabal: dependencies conflict: ghc-7.0.3 requires containers ==0.4.0.0 however containers-0.4.0.0 was excluded because ghc-7.0.3 requires containers ==0.4.2.0 $ cabal install hpath Resolving dependencies... cabal: cannot configure HPath-0.0.2. It requires base >=2 && <=4 For the dependency on base >=2 && <=4 there are these packages: base-3.0.3.1 and base-3.0.3.2. However none of them are available. base-3.0.3.1 was excluded because of the top level dependency base -any base-3.0.3.2 was excluded because of the top level dependency base -any