Can you try upgrading to yesod-bin-1.5.0? Some of the issues with the old yesod-bin are documented at: http://www.yesodweb.com/blog/2016/11/new-yesod-devel-server Looking at that error message, I'm going to take a (very bad) guess and say you're using GHC 8. If that's the case, yesod-bin 1.4 is definitely _not_ compatible with it. On Mon, Jan 16, 2017 at 4:34 AM, Geraldus wrote:

Hi folks!

I haven't used Yesod quite a while; now when I'm trying to run development server of freshly scaffolded PostgreSQL stack's template I see this error message:

Rebuilding application... (using cabal) Starting development server... *<command line>: cannot satisfy -package-key main* (use -v for more information) Exit code: ExitFailure 1

I've found several issues on the web, however I wasn't able to resolve this.

I've tried to upgrade my Yesod binary first via `stack install yesod-bin`. Now I have:

stack exec yesod version *yesod-bin version: 1.4.18.7*

stack --version *Version 1.1.2 x86_64 hpack-0.14.0*

I also tried to comment out the test suite section in cabal file, but devel server still fails to run.

Can someone clarify how to deal with this?

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