react-starter-kit: ERROR in ./src/data/queries/content.js

bash-3.2$ npm start

> @ start /Users/richb/github/react-starter-kit-richb
> babel-node tools/run start

[22:16:08] Starting 'start'...
[22:16:08] Starting 'clean'...
[22:16:08] Finished 'clean' after 42 ms
[22:16:08] Starting 'bound copy'...
build/package.json
[22:16:08] Finished 'bound copy' after 149 ms
webpack built 422ba140c5b05339f7a8 in 5251ms
Child
    Time: 5251ms
                           Asset     Size  Chunks             Chunk Names
    main.js?422ba140c5b05339f7a8  3.39 MB       0  [emitted]  main
Child
    Time: 4803ms
            Asset    Size  Chunks             Chunk Names
        server.js  228 kB       0  [emitted]  main
    server.js.map  232 kB       0  [emitted]  main

    ERROR in ./src/data/queries/content.js
    Module build failed: SyntaxError: /Users/richb/github/react-starter-kit-richb/src/data/queries/content.js: "success" is read-only (This is an error on an internal node. Probably an internal error. Location has been estimated.)
        1 | /**
        2 |  * React Starter Kit (https://www.reactstarterkit.com/)
        3 |  *
        4 |  * Copyright © 2014-2016 Kriasoft, LLC. All rights reserved.
        5 |  *
        6 |  * This source code is licensed under the MIT license found in the
        7 |  * LICENSE.txt file in the root directory of this source tree.
        8 |  */
        9 |
       10 | import fs from 'fs';
       11 | import { join } from 'path';
       12 | import Promise from 'bluebird';
       13 | import jade from 'jade';
       14 | import fm from 'front-matter';
       15 |
       16 | import {
       17 |   GraphQLString as StringType,
       18 |   GraphQLNonNull as NonNull,
       19 | } from 'graphql';
       20 |
       21 | import ContentType from '../types/ContentType';
       22 |
       23 | const md = require('markdown-it')();
       24 |
       25 | // A folder with Jade/Markdown/HTML content pages
       26 | const CONTENT_DIR = join(__dirname, './content');
       27 |
       28 | // Extract 'front matter' metadata and generate HTML
       29 | const parseContent = (path, fileContent, extension) => {
       30 |   const fmContent = fm(fileContent);
       31 |   let htmlContent;
       32 |   switch (extension) {
       33 |     case '.jade':
       34 |       htmlContent = jade.render(fmContent.body);
       35 |       break;
       36 |     case '.md':
       37 |       htmlContent = md.render(fmContent.body);
       38 |       break;
       39 |     case '.html':
       40 |       htmlContent = fmContent.body;
       41 |       break;
       42 |     default:
       43 |       return null;
       44 |   }
       45 |   return Object.assign({ path, content: htmlContent }, fmContent.attributes);
       46 | };
       47 |
       48 | const readFile = Promise.promisify(fs.readFile);
       49 | const fileExists = filename => new Promise(resolve => {
       50 |   fs.exists(filename, resolve);
       51 | });
       52 |
       53 | async function resolveExtension(path, extension) {
       54 |   let fileNameBase = join(CONTENT_DIR, `${path === '/' ? '/index' : path}`);
       55 |   let ext = extension;
       56 |   if (!ext.startsWith('.')) {
       57 |     ext = `.${extension}`;
       58 |   }
       59 |
       60 |   let fileName = fileNameBase + ext;
       61 |
       62 |   if (!(await fileExists(fileName))) {
       63 |     fileNameBase = join(CONTENT_DIR, `${path}/index`);
       64 |     fileName = fileNameBase + ext;
       65 |   }
       66 |
       67 |   if (!(await fileExists(fileName))) {
       68 |     return { success: false };
       69 |   }
       70 |
       71 |   return { success: true, fileName };
       72 | }
       73 |
       74 | async function resolveFileName(path) {
       75 |   const extensions = ['.jade', '.md', '.html'];
       76 |
       77 |   for (const extension of extensions) {
       78 |     const maybeFileName = await resolveExtension(path, extension);
       79 |     if (maybeFileName.success) {
       80 |       return { success: true, fileName: maybeFileName.fileName, extension };
       81 |     }
       82 |   }
       83 |
       84 |   return { success: false, fileName: null, extension: null };
       85 | }
       86 |
       87 | export default {
       88 |   type: ContentType,
       89 |   args: {
       90 |     path: { type: new NonNull(StringType) },
       91 |   },
       92 |   async resolve({ request }, { path }) {
       93 |     const { success, fileName, extension } = await resolveFileName(path);
       94 |     if (!success) {
       95 |       return null;
       96 |     }
       97 |
       98 |     const source = await readFile(fileName, { encoding: 'utf8' });
       99 |     return parseContent(path, source, extension);
      100 |   },
      101 | };
      102 |
        at File.buildCodeFrameError (/Users/richb/github/react-starter-kit-richb/node_modules/babel-core/lib/transformation/file/index.js:431:15)
        at NodePath.buildCodeFrameError (/Users/richb/github/react-starter-kit-richb/node_modules/babel-traverse/lib/path/index.js:150:26)
        at PluginPass.Scope (/Users/richb/github/react-starter-kit-richb/node_modules/babel-plugin-check-es2015-constants/lib/index.js:33:29)
        at PluginPass.newFn (/Users/richb/github/react-starter-kit-richb/node_modules/babel-traverse/lib/visitors.js:326:17)
        at newFn (/Users/richb/github/react-starter-kit-richb/node_modules/babel-traverse/lib/visitors.js:293:19)
        at NodePath._call (/Users/richb/github/react-starter-kit-richb/node_modules/babel-traverse/lib/path/context.js:75:18)
        at NodePath.call (/Users/richb/github/react-starter-kit-richb/node_modules/babel-traverse/lib/path/context.js:47:17)
        at NodePath.visit (/Users/richb/github/react-starter-kit-richb/node_modules/babel-traverse/lib/path/context.js:105:12)
        at TraversalContext.visitQueue (/Users/richb/github/react-starter-kit-richb/node_modules/babel-traverse/lib/context.js:156:16)
        at TraversalContext.visitMultiple (/Users/richb/github/react-starter-kit-richb/node_modules/babel-traverse/lib/context.js:108:17)
        at TraversalContext.visit (/Users/richb/github/react-starter-kit-richb/node_modules/babel-traverse/lib/context.js:198:19)
        at Function.traverse.node (/Users/richb/github/react-starter-kit-richb/node_modules/babel-traverse/lib/index.js:141:17)
        at NodePath.visit (/Users/richb/github/react-starter-kit-richb/node_modules/babel-traverse/lib/path/context.js:115:22)
        at TraversalContext.visitQueue (/Users/richb/github/react-starter-kit-richb/node_modules/babel-traverse/lib/context.js:156:16)
        at TraversalContext.visitMultiple (/Users/richb/github/react-starter-kit-richb/node_modules/babel-traverse/lib/context.js:108:17)
        at TraversalContext.visit (/Users/richb/github/react-starter-kit-richb/node_modules/babel-traverse/lib/context.js:198:19)
        at Function.traverse.node (/Users/richb/github/react-starter-kit-richb/node_modules/babel-traverse/lib/index.js:141:17)
     @ ./src/data/schema.js 14:15-43
webpack: bundle is now VALID.

/Users/richb/github/react-starter-kit-richb/build/webpack:/src/data/schema.js:20
      content: require('./queries/content').default,
                       ^
Error: Cannot find module "./queries/content"
    at webpackMissingModule (/Users/richb/github/react-starter-kit-richb/build/webpack:/src/data/schema.js:20:24)
    at Object.module.exports.Object.defineProperty.value (/Users/richb/github/react-starter-kit-richb/build/webpack:/src/data/schema.js:20:24)
    at __webpack_require__ (/Users/richb/github/react-starter-kit-richb/build/webpack:/webpack/bootstrap 28be67f138acd4b95a5f:19:1)
    at Object.<anonymous> (/Users/richb/github/react-starter-kit-richb/build/webpack:/webpack/bootstrap 28be67f138acd4b95a5f:39:1)
    at __webpack_require__ (/Users/richb/github/react-starter-kit-richb/build/webpack:/webpack/bootstrap 28be67f138acd4b95a5f:19:1)
    at /Users/richb/github/react-starter-kit-richb/build/webpack:/webpack/bootstrap 28be67f138acd4b95a5f:39:1
    at Object.<anonymous> (/Users/richb/github/react-starter-kit-richb/build/webpack:/webpack/bootstrap 28be67f138acd4b95a5f:39:1)
    at Module._compile (module.js:398:26)
    at Object.Module._extensions..js (module.js:405:10)
    at Module.load (module.js:344:32)
    at Function.Module._load (module.js:301:12)
    at Function.Module.runMain (module.js:430:10)
    at startup (node.js:141:18)
    at node.js:980:3