What version of Stack are you using (stack --version), and how did you install Stack and GHC?

It looks like you're using a system-wide GHC installation, which (for reasons like this) we by default no longer use by default in recent Stack releases.

Upgrading to the latest Stack (via `stack upgrade` or following the instructions at [1]) will probably solve the problem.

[1] https://haskell-lang.org/get-started/osx

On Thu, Dec 7, 2017 at 8:43 AM, Quentin Liu <quentin.liu.0415@gmail.com> wrote:

Hi,

I was trying to use Parsec and imported Text.ParserCombinators.Parsec. I could call “stack ghc” to compile the file, but when I loaded the file into ghci and called any function, ghci would report errors

can't load .so/.DLL for: /Users/HereWegoR/.stack/snapshots/x86_64-osx/lts-8.8/8.0.2/lib/x86_64-osx-ghc-8.0.2/libHSmtl-2.2.1-BLKBelFsPB3BoFeSWSOYj6-ghc8.0.2.dylib (dlopen(/Users/HereWegoR/.stack/snapshots/x86_64-osx/lts-8.8/8.0.2/lib/x86_64-osx-ghc-8.0.2/libHSmtl-2.2.1-BLKBelFsPB3BoFeSWSOYj6-ghc8.0.2.dylib, 5): Library not loaded: /usr/local/opt/ghc/lib/ghc-8.0.2/transformers-0.5.2.0/libHStransformers-0.5.2.0-ghc8.0.2.dylib

  Referenced from: /Users/HereWegoR/.stack/snapshots/x86_64-osx/lts-8.8/8.0.2/lib/x86_64-osx-ghc-8.0.2/libHSmtl-2.2.1-BLKBelFsPB3BoFeSWSOYj6-ghc8.0.2.dylib

  Reason: image not found)

I tried to install transformers by calling `stack install transformers` but the problem still persisted. Is it because the version of transformers in my repo is different from the one referenced by `mtl` package? How should I fix it?

Regards,

Qingbo Liu

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