Question

I am trying to upgrade my Yesod project to version 1.1 and it was working fine with version 1.0. Now I am trying to run my project on version 1.1. When trying to run yesod --dev devel I get the following error:

cabal-dev: user error (Warning: cannot determine version of /home/user/.cabal/bin/fake-ghc-cabal-dev
:
"== GHC Arguments: Start ==\n--numeric-version\n== GHC Arguments: End ==\n"
cabal: ghcInvocation: the programVersion must not be Nothing
)
yesod: readProcess: cabal-dev "buildopts" (exit 1): failed

What is the problem here?

Answer 1

I am not sure what the problem exactly was, but upgrading cabal-dev, cabal-install and cabal did the trick.

cabal install cabal-dev cabal-install cabal