FATAL: Improperly formatted configuration file mimosa-config.coffee: Error: Cannot find module 'emblem'

I use 'mimosa' as my build tool and to bootstrap an Ember.js project, I used the ‘ember-peepcode’ seed as it takes into account the Ember.js framework’s best practices.

So today I started creating the app with the following:

$ mimosa skel:new ember-peepcode my-app
$ npm install
$ bower install

No error occured while creating it.

When i started to build it using:

$ mimosa watch -s

or

$ mimosa build

I get the following error

FATAL: Improperly formatted configuration file mimosa-config.coffee: Error: Cannot find module 'emblem'

I have never got this error before. Cannot find what's wrong in the config.cofee file.

Any help would be much appreciated.