Although also a bit of a global hack, you could also hide one of the
packages using
ghc-pkg hide mtl-1.1.02
instead of uninstalling them I think.
Also, if you make a cabal file, you could specify the exact module you
want to use.
On Fri, Sep 4, 2009 at 11:03 PM, Michael Vanier
Hi everyone,
I ran into this error when recompiling some code I hadn't worked on in a while:
Foo.hs:19:7: Could not find module `Control.Monad.Error': it was found in multiple packages: monads-fd-0.0.0.1 mtl-1.1.0.2
I gather that monads-fd is supposed to be a replacement for mtl, but I have both of them (mtl from the normal GHC 6.10.4 install, monads-fd from cabal). I don't really care which one I use, though mtl has been fine in the past. In the past, I had to manually uninstall cabal packages that used incompatible libraries. Is this still the case?
TIA,
Mike
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