Gatsby+Contentful+Netlifyでのサイト構築のビルドが失敗する

https://github.com/ryanwiemer/gatsby-starter-gcn
をクローンして自分のGitHubのリポジトリに格納。

Netlifyにて、ドキュメントどおりにデプロイしたところエラーでビルドがうまくいきません。

※Contentfulを登録、各種設定して、APIキー（ACCESS_TOKENとSPACE_ID）を取得して、Netlifyへ記述済みです。

＜エラーコード＞
TypeError: Cannot read property 'allContentfulPost' of undefined

どうしたらよいのかさっぱりわからないので、質問させてください。
よろしくお願いいたします。

＜エラーログ＞

10:59:39 PM: Build ready to start
10:59:40 PM: build-image version: 12783d4d177a66bec5a23ad1097ea7bd02931128
10:59:40 PM: buildbot version: 5a64b5cb0ce1ed3ba485935522483a4d39e15107
10:59:40 PM: Fetching cached dependencies
10:59:41 PM: Failed to fetch cache, continuing with build
10:59:41 PM: Starting to prepare the repo for build
10:59:41 PM: No cached dependencies found. Cloning fresh repo
10:59:41 PM: git clone https://github.com/min0124/live-method
10:59:42 PM: Preparing Git Reference refs/heads/master
10:59:42 PM: Starting build script
10:59:42 PM: Installing dependencies
10:59:43 PM: Downloading and installing node v8.13.0...
10:59:43 PM: Downloading https://nodejs.org/dist/v8.13.0/node-v8.13.0-linux-x64.tar.xz...
10:59:44 PM: 
#
10:59:44 PM:   1.8%
10:59:44 PM: 
#####################################
10:59:44 PM:                                   52.1%
10:59:44 PM: 
########################################################
10:59:44 PM: ################ 100.0%
10:59:44 PM: Computing checksum with sha256sum
10:59:44 PM: Checksums matched!
10:59:46 PM: Now using node v8.13.0 (npm v6.4.1)
10:59:46 PM: Attempting ruby version 2.3.6, read from environment
10:59:47 PM: Using ruby version 2.3.6
10:59:47 PM: Using PHP version 5.6
10:59:47 PM: Started restoring cached node modules
10:59:47 PM: Finished restoring cached node modules
10:59:48 PM: Installing NPM modules using NPM version 6.4.1
11:00:36 PM: > sharp@0.20.8 install /opt/build/repo/node_modules/sharp
11:00:36 PM: > (node install/libvips && node install/dll-copy && prebuild-install) || (node-gyp rebuild && node install/dll-copy)
11:00:36 PM: info
11:00:36 PM:  sharp Detected globally-installed libvips v8.6.2
11:00:36 PM: info sharp Building from source via node-gyp
11:00:38 PM: make: Entering directory `/opt/build/repo/node_modules/sharp/build'
11:00:38 PM:   TOUCH Release/obj.target/libvips-cpp.stamp
11:00:38 PM:   CXX(target) Release/obj.target/sharp/src/common.o
11:00:40 PM:   CXX(target) Release/obj.target/sharp/src/metadata.o
11:00:41 PM:   CXX(target) Release/obj.target/sharp/src/stats.o
11:00:43 PM:   CXX(target) Release/obj.target/sharp/src/operations.o
11:00:45 PM:   CXX(target) Release/obj.target/sharp/src/pipeline.o
11:00:48 PM:   CXX(target) Release/obj.target/sharp/src/sharp.o
11:00:49 PM:   CXX(target) Release/obj.target/sharp/src/utilities.o
11:00:51 PM:   SOLINK_MODULE(target) Release/obj.target/sharp.node
11:00:51 PM:   COPY Release/sharp.node
11:00:51 PM: make: Leaving directory `/opt/build/repo/node_modules/sharp/build'
11:00:52 PM: > cwebp-bin@4.0.0 postinstall /opt/build/repo/node_modules/cwebp-bin
11:00:52 PM: > node lib/install.js
11:00:53 PM:   ✔ cwebp pre-build test passed successfully
11:00:53 PM: > mozjpeg@5.0.0 postinstall /opt/build/repo/node_modules/mozjpeg
11:00:53 PM: > node lib/install.js
11:00:53 PM:   ⚠ The `/opt/build/repo/node_modules/mozjpeg/vendor/cjpeg` binary doesn't seem to work correctly
11:00:53 PM:   ⚠ mozjpeg pre-build test failed
11:00:53 PM:   ℹ compiling from source
11:01:32 PM:   ✔ mozjpeg built successfully
11:01:32 PM: > pngquant-bin@5.0.0 postinstall /opt/build/repo/node_modules/pngquant-bin
11:01:32 PM: > node lib/install.js
11:01:33 PM:   ✔ pngquant pre-build test passed successfully
11:01:33 PM: > styled-components@4.0.2 postinstall /opt/build/repo/node_modules/styled-components
11:01:33 PM: > node ./scripts/postinstall.js || exit 0
11:01:33 PM: Use styled-components at work? Consider supporting our development efforts at https://opencollective.com/styled-components
11:01:40 PM: npm
11:01:40 PM:  WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@1.2.4 (node_modules/fsevents):
11:01:40 PM: npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.2.4: wanted {"os":"darwin","arch":"any"} (current: {"os":"linux","arch":"x64"})
11:01:40 PM: added 2340 packages from 1249 contributors and audited 30939 packages in 111.962s
11:01:40 PM: found 5 moderate severity vulnerabilities
11:01:40 PM:   run `npm audit fix` to fix them, or `npm audit` for details
11:01:40 PM: NPM modules installed
11:01:41 PM: Started restoring cached go cache
11:01:41 PM: Finished restoring cached go cache
11:01:41 PM: unset GOOS;
11:01:41 PM: unset GOARCH;
11:01:41 PM: export GOROOT='/opt/buildhome/.gimme/versions/go1.10.linux.amd64';
11:01:41 PM: export PATH="/opt/buildhome/.gimme/versions/go1.10.linux.amd64/bin:${PATH}";
11:01:41 PM: go version >&2;
11:01:41 PM: export GIMME_ENV='/opt/buildhome/.gimme/env/go1.10.linux.amd64.env';
11:01:41 PM: go version go1.10 linux/amd64
11:01:41 PM: Installing missing commands
11:01:41 PM: Verify run directory
11:01:41 PM: Executing user command: gatsby build
11:01:43 PM: success open and validate gatsby-configs — 0.008 s
11:01:43 PM: success load plugins — 0.304 s
11:01:44 PM: success onPreInit — 0.710 s
11:01:44 PM: success delete html and css files from previous builds — 0.083 s
11:01:44 PM: success initialize cache — 0.009 s
11:01:44 PM: success copy gatsby files — 0.131 s
11:01:44 PM: success onPreBootstrap — 0.011 s
11:01:44 PM: Starting to fetch data from Contentful
11:01:44 PM: Fetching default locale
11:01:44 PM: default locale is : en-US
11:01:49 PM: contentTypes fetched 10
11:01:49 PM: Updated entries  37
11:01:49 PM: Deleted entries  0
11:01:49 PM: Updated assets  0
11:01:49 PM: Deleted assets  0
11:01:49 PM: Fetch Contentful data: 5234.619ms
11:01:50 PM: success source and transform nodes — 5.600 s
11:01:50 PM: success building schema — 0.489 s
11:01:50 PM: error Cannot read property 'allContentfulPost' of undefined
11:01:50 PM: 
11:01:50 PM:   TypeError: Cannot read property 'allContentfulPost' of undefined
11:01:50 PM:   
11:01:50 PM:   - gatsby-node.js:23 graphql.then.result
11:01:50 PM:     /opt/build/repo/gatsby-node.js:23:33
11:01:50 PM:   
11:01:50 PM:   - util.js:16 tryCatcher
11:01:50 PM:     [repo]/[bluebird]/js/release/util.js:16:23
11:01:50 PM:   
11:01:50 PM:   - promise.js:512 Promise._settlePromiseFromHandler
11:01:50 PM:     [repo]/[bluebird]/js/release/promise.js:512:31
11:01:50 PM:   
11:01:50 PM:   - promise.js:569 Promise._settlePromise
11:01:50 PM:     [repo]/[bluebird]/js/release/promise.js:569:18
11:01:50 PM:   
11:01:51 PM:   - promise.js:606 Promise._settlePromiseCtx
11:01:51 PM:     [repo]/[bluebird]/js/release/promise.js:606:10
11:01:51 PM:   
11:01:51 PM:   - async.js:142 _drainQueueStep
11:01:51 PM:     [repo]/[bluebird]/js/release/async.js:142:12
11:01:51 PM:   
11:01:51 PM:   - async.js:131 _drainQueue
11:01:51 PM:     [repo]/[bluebird]/js/release/async.js:131:9
11:01:51 PM:   
11:01:51 PM:   - async.js:147 Async._drainQueues
11:01:51 PM:     [repo]/[bluebird]/js/release/async.js:147:5
11:01:51 PM:   
11:01:51 PM:   - async.js:17 Immediate.Async.drainQueues
11:01:51 PM:     [repo]/[bluebird]/js/release/async.js:17:14
11:01:51 PM:   
11:01:51 PM: 
11:01:51 PM: error UNHANDLED REJECTION
11:01:51 PM: 
11:01:51 PM:   TypeError: Cannot read property 'allContentfulPost' of undefined
11:01:51 PM:   
11:01:51 PM:   - gatsby-node.js:23 graphql.then.result
11:01:51 PM:     /opt/build/repo/gatsby-node.js:23:33
11:01:51 PM:   
11:01:51 PM:   - util.js:16 tryCatcher
11:01:51 PM:     [repo]/[bluebird]/js/release/util.js:16:23
11:01:51 PM:   
11:01:51 PM:   - promise.js:512 Promise._settlePromiseFromHandler
11:01:51 PM:     [repo]/[bluebird]/js/release/promise.js:512:31
11:01:51 PM:   
11:01:51 PM:   - promise.js:569 Promise._settlePromise
11:01:51 PM:     [repo]/[bluebird]/js/release/promise.js:569:18
11:01:51 PM:   
11:01:51 PM:   - promise.js:606 Promise._settlePromiseCtx
11:01:51 PM:     [repo]/[bluebird]/js/release/promise.js:606:10
11:01:51 PM:   
11:01:51 PM:   - async.js:142 _drainQueueStep
11:01:51 PM:     [repo]/[bluebird]/js/release/async.js:142:12
11:01:51 PM:   
11:01:51 PM:   - async.js:131 _drainQueue
11:01:51 PM:     [repo]/[bluebird]/js/release/async.js:131:9
11:01:51 PM:   
11:01:51 PM:   - async.js:147 Async._drainQueues
11:01:51 PM:     [repo]/[bluebird]/js/release/async.js:147:5
11:01:51 PM:   
11:01:51 PM:   - async.js:17 Immediate.Async.drainQueues
11:01:51 PM:     [repo]/[bluebird]/js/release/async.js:17:14
11:01:51 PM:   
11:01:51 PM: 
11:01:51 PM: Caching artifacts
11:01:51 PM: Started saving node modules
11:01:51 PM: Finished saving node modules
11:01:51 PM: Started saving pip cache
11:01:51 PM: Finished saving pip cache
11:01:51 PM: Started saving emacs cask dependencies
11:01:51 PM: Finished saving emacs cask dependencies
11:01:51 PM: Started saving maven dependencies
11:01:51 PM: Finished saving maven dependencies
11:01:51 PM: Started saving boot dependencies
11:01:51 PM: Finished saving boot dependencies
11:01:51 PM: Started saving go dependencies
11:01:51 PM: Finished saving go dependencies
11:01:51 PM: Cached node version v8.13.0
11:01:51 PM: Error running command: Build script returned non-zero exit code: 1
11:01:51 PM: Failing build: Failed to build site
11:01:51 PM: failed during stage 'building site': Build script returned non-zero exit code: 1
11:01:52 PM: Finished processing build request in 2m11.335637823s