Karma fails running the webpack processor

[grofit]

I keep getting an error from Karma saying:

06 07 2016 11:04:22.640:ERROR [preprocess]: Can not load "webpack"!
  TypeError: this.list.forEach is not a function
    at new LoadersList (<project-url>\node_modules\webpack-core\lib\LoadersList.js:7:12)
    ...

So it seems to be blowing up because of some ES5 syntax in there, but I have no clue why as it should all be fine. Cannot find anyone with same problem, am running latest Karma (tried the 0.13.* releases too), using Firefox and PhantomJS both browsers have same error.

[grofit]

solved it, its always the case when you write up your issue then you find something which solves it, and for anyone else it was because I was using loaders in the webpack config not loader