webpackJsonp is not defined？

var webpack = require('webpack');
var path = require('path');
var buildPath = path.resolve(__dirname,"build");
// var nodemodulesPath = path.resolve(__dirname,'node_modules');

var config = {
    //入口文件配置
    entry:{
        // app:path.resolve(__dirname,'src/main.js'),
        main:path.resolve(__dirname,'src/main.js'),
        main1:path.resolve(__dirname,'src/main1.js'),
        common: ["./src/js/common"] //【1】注意这里
      },
    resolve:{
        extentions:["","js"]//当requrie的模块找不到时，添加这些后缀
    },
    //文件导出的配置
    output:{
        path:buildPath,
        filename:"[name].js"
    },
    // module: {
    //     loaders: [{
    //         test: /.(js|jsx)$/,
    //         loaders: ['babel'],
    //         exclude: /(node_modules|bower_components)/
    //         //排除不处理的目录
    //     }]
    // },
    plugins: [
        new webpack.DefinePlugin({
          'process.env': {
            'NODE_ENV': '"production"'
          }
        }),
         //【2】注意这里  这两个地方市用来配置common.js模块单独打包的
         new webpack.optimize.CommonsChunkPlugin({
            name: "common",//和上面配置的入口对应
            filename: "commonFun.js"//导出的文件的名称
        })
         //压缩打包的文件
        // new webpack.optimize.UglifyJsPlugin(),
        // new webpack.optimize.OccurenceOrderPlugin(),
        // new webpack.optimize.AggressiveMergingPlugin(),
         //允许错误不打断程序
        // new webpack.NoErrorsPlugin()
    ]
}

module.exports = config;