hidden package problem

[CCH C]

hi, I using process package, I specify it in cabal file, and succeed compiling. However, when running and responding to a request, an error occurs, basically saying process is a hidden package.

How could it be that compiling succeeds and running fails?

[shahn]

Perhaps you are running an old version of your application that is installed in $HOME/.cabal/bin?
In that case, try 'cabal install' and restarting your snap application.

If you change your cabal file (or src/Main.hs) you have to reinstall and restart. Snap cannot reload changes to these files.

HTH,
Sönke

[Dmitry Dzhus]

22.03.2012, 16:10, "shahn" <soenk...@gmail.com>:

> Perhaps you are running an old version of your application that is installed in $HOME/.cabal/bin?
> In that case, try 'cabal install' and restarting your snap application.

Use `cabal-dev`, it's a handy tool for isolated builds and makes it
easier to add development versions of dependencies to packages list
local to your project, not ~/.cabal.

[Chris Smith]

If you're getting an error about a hidden package at runtime, that
means you're likely using the development loader. The development
loader uses hint to build your code at runtime, and rebuild it when
you change the source code. I'm not familiar with the development
loader, or if it would work with cabal-dev.

--
Chris Smith

[CCH C]

hi all, I use cabal install, no development, and do reinstall. 

I finally copy the source code to another machine to compile and run, and it succeeds. 

Is it possible due to incorrect dependency relation?