[Haskell] Visual Haskell: Could not find module `Control.Monad.Writer'

Hi all, I am playing around with Visual Haskell, V0.1 (which really is great stuff!). In the main module I wrote the following import: import Control.Monad.Writer for which I get the error message: Could not find module `Control.Monad.Writer': use -v to see a list of the files searched for I use the GHCOptions: -fglasgow-exts -fallow-overlapping-instances. Is this a bug in Visual Haskell or what's wrong here? Thanks, Bernd