cabal update followed by cabal upgrade yesod did it for me. Thanks. Amitava On Wed, May 4, 2011 at 3:06 PM, Amitava Shee wrote:

I have cabal installed yesod already and the app runs fine with runhaskell. I get the error only when invoked via wai-handler-devel.

-Amitava

On Wed, May 4, 2011 at 2:45 PM, Grant Weyburne wrote:

...

Hi Amitava,

In case you are missing the yesod module.

cabal install yesod

(some small changes to get this to work with wai developer and yesod >= 7)

Grant

{-# LANGUAGE TypeFamilies, QuasiQuotes, MultiParamTypeClasses, TemplateHaskell, OverloadedStrings #-}

module HelloWorld where

import Yesod

data HelloWorld = HelloWorld

mkYesod "HelloWorld" [parseRoutes| / HomeR GET |]

instance Yesod HelloWorld where approot _ = ""

getHomeR = defaultLayout [hamlet|Hello World!|]

withHelloWorld f = toWaiApp HelloWorld >>= f

main = warpDebug 3000 HelloWorld

2011/5/4 Amitava Shee

...

I am reading the yesod book - http://www.yesodweb.com/book/basics

Can someone help me resolve the following issue?

amitava$ wai-handler-devel 3000 HelloWorld withHelloWorld Attempting to interpret your app... Compile failed:

Could not find module `Yesod': Use -v to see a list of the files searched for.

Furthermore, the -v option is not recognized by wai-handler-dev. I am assuming this is a message from the underlying compiler. How do I pass compiler/interpreter flags from wai-devel-handler?

Thanks & Regards, Amitava Shee

There are two ways of constructing a software design. One is to make it so simple that there are obviously no deficiencies; the other is to make it so complicated that there are no obvious deficiencies. The first method is far more difficult. -- C. A. R. Hoare The Emperor's Old Clothes, CACM February 1981

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-- Amitava Shee Software Architect

There are two ways of constructing a software design. One is to make it so simple that there are obviously no deficiencies; the other is to make it so complicated that there are no obvious deficiencies. The first method is far more difficult. -- C. A. R. Hoare The Emperor's Old Clothes, CACM February 1981

-- Amitava Shee Software Architect There are two ways of constructing a software design. One is to make it so simple that there are obviously no deficiencies; the other is to make it so complicated that there are no obvious deficiencies. The first method is far more difficult. -- C. A. R. Hoare The Emperor's Old Clothes, CACM February 1981