Rollup: Module resolution error

[mohsen1]

First time using Rollup so excuse my noob question!

I'm getting this module resolution error while I don't see anything missing from the tutorial...

// rollup.config.js
import json from 'rollup-plugin-json';
import babel from 'rollup-plugin-babel';

export default {
  entry: './src/client/App.jsx',
  format: 'cjs',
  plugins: [ json(), babel() ],
  format: 'cjs',
  dest: 'bundle.js' // equivalent to --output
};

// .babelrc
{
    "presets": [
        "react",
        "es2015-rollup"
    ],
    "plugins": [
        "external-helpers"
    ]
}

$ rollup -c
Treating 'babel-polyfill' as external dependency
Treating 'react' as external dependency
Treating 'react-dom' as external dependency
Treating 'react-redux' as external dependency
Treating 'redux' as external dependency
Treating 'react-router' as external dependency
Treating 'react-router-redux' as external dependency
Treating 'redux-thunk' as external dependency
Treating 'lodash/lang/isEmpty' as external dependency
Could not resolve '../reducers' from /code/src/client/App.jsx
Error: Could not resolve '../reducers' from /code/src/client/App.jsx
    at /usr/lib/node_modules/rollup/src/Bundle.js:256:41
    at process._tickCallback (node.js:368:9)
    at Function.Module.runMain (module.js:469:11)
    at startup (node.js:136:18)
    at node.js:963:3
Type rollup --help for help, or visit https://github.com/rollup/rollup/wiki
$ cd src/client/
$ ls
App.jsx  normalize.scss
$ cat ../reducers/index.js
// Temporary reducer to verify state is working properly
import { combineReducers } from 'redux';
import API from './api';
import Experiments from './experiments';
import Device from './device';

export default combineReducers({
    API,
    Experiments,
    Device,
});

[TrySound]

https://github.com/rollup/rollup-plugin-node-resolve
https://github.com/rollup/rollup-plugin-commonjs