webpack -p breaking app

webpack.config.build.js

var host              = 'localhost';
var port              = parseInt(process.env.PORT) + 1 || 3001;
var path              = require('path');
var bourbon           = require('node-bourbon').includePaths;
var ExtractTextPlugin = require('extract-text-webpack-plugin');
var HtmlWebpackPlugin = require('html-webpack-plugin');
var Clean             = require('clean-webpack-plugin');
var gitInfo           = require('git-repo-info')();

var bower_dir = __dirname + '/bower_components';

var config = {
    entry: path.resolve(__dirname, 'app/app.js'),
    output: {
        path: path.resolve(__dirname, 'build'),
        filename: 'js/presentationbuilder.bundle.js',
        //publicPath: 'http://' + host + ':' + port + '/public/'
    },
    resolve: {
      alias: {
        'env': path.join(__dirname, 'app/config/config-build.js')
      }
    },
    plugins: [
      new Clean(['build']),
      new ExtractTextPlugin('css/presentationbuilder.bundle.css', {
        allChunks: true
      }),
      new HtmlWebpackPlugin({
        gitHash: gitInfo.abbreviatedSha,
        filename: 'index.html',
        template: path.resolve(__dirname, 'app/index.html'), // Load a custom template
        inject: false // Do NOT inject any scripts into the html
      })
    ],
    module: {
        noParse: [],
        loaders: [
            { test: /\.(jsx|js)$/, exclude: /(node_modules|bower_components)/, loader: 'babel' }, // REACTJS FILES
            { test: /\.json?$/, exclude: /(node_modules|bower_components)/, loader: 'json' }, // JSON FILES
            { test: /\.scss$/, loader: ExtractTextPlugin.extract('css!sass?includePaths[]=' + bourbon, { publicPath: '../'}) }, // SASS & CSS FILES
            { test: /\.(jpe?g|png|gif|svg)$/i, exclude: /(node_modules|bower_components)/, loader: 'url?limit=1000&name=res/img/[name].[ext]' } // IMAGES
        ]
    },
    progress: true
};

module.exports = config;