TypeError: Cannot read property 'length' of null

Using webpack 2 beta 6.

Trace:

chunk main [entry]
3-12ccc3f32505ae5e2d7e.js
Cannot read property 'length' of null
TypeError: Cannot read property 'length' of null
    at /Users/mmahalwy/Sites/sparrow/node_modules/webpack/lib/ContextModule.js:139:25
    at Array.forEach (native)
    at Module.ContextModule.source (/Users/mmahalwy/Sites/sparrow/node_modules/webpack/lib/ContextModule.js:137:6)
    at Template.ModuleTemplate.render (/Users/mmahalwy/Sites/sparrow/node_modules/webpack/lib/ModuleTemplate.js:14:28)
    at Template.renderChunkModules (/Users/mmahalwy/Sites/sparrow/node_modules/webpack/lib/Template.js:115:31)
    at Template.<anonymous> (/Users/mmahalwy/Sites/sparrow/node_modules/webpack/lib/MainTemplate.js:36:22)
    at Template.applyPluginsWaterfall (/Users/mmahalwy/Sites/sparrow/node_modules/tapable/lib/Tapable.js:34:24)
    at Template.MainTemplate.render (/Users/mmahalwy/Sites/sparrow/node_modules/webpack/lib/MainTemplate.js:129:20)
    at Compilation.createChunkAssets (/Users/mmahalwy/Sites/sparrow/node_modules/webpack/lib/Compilation.js:845:33)
    at Compilation.<anonymous> (/Users/mmahalwy/Sites/sparrow/node_modules/webpack/lib/Compilation.js:556:9)

Relevant code:

const loadContainerAsync = route => (location, cb) => {
  console.log(location, cb);
 //  require.ensure([], (require) => {
 //    cb(null, require('./containers/' + route + '/index.js'));
 // });
 // console.log(location);
 return System.import(`./containers/${route}/index.js`).then(module => cb(null, module)).catch(err => console.log(err));
};

[sokra]

Have you tried

System.import(`...`).then(module => cb(null, module.default))

[sebastienbarre]

@valerybugakov correct, with a variable. Like this:

        System.import('girder/models/' + modelName).then(function (Model) {
            var parent = new Model.default();
...