gatsby jsでキャッシュ周りのエラーの対処法

このURLの通りにサンプルブログをつくろうとしていますが、下記のようなエラーがでてしまいます。

gatsby cleanをやったり、違うversionにしてみたり、npm install --save core-js@3を実行してみたりしていますが、かわらず、エラーが解消されません。解決方法についてなにかご存知のかたいましたらご教示いただけませんでしょうか？

$ gatsby -v
Gatsby CLI version: 4.4.0
Gatsby version: 2.32.13
$ node -v
v15.12.0

console
1 ~/gatsbyjs-and-contentful (master) $ gatsby develop
2...
3...
4success building schema - 0.765s
5
6 ERROR #85923  GRAPHQL
7
8There was an error in your GraphQL query:
9
10Cannot query field "allContentfulBlogPost" on type "Query".
11
12If you don't expect "allContentfulBlogPost" to exist on the type "Query" it is most likely a typo.
13However, if you expect "allContentfulBlogPost" to exist there are a couple of solutions to common problems:
14
15- If you added a new data source and/or changed something inside gatsby-node.js/gatsby-config.js, please try a restart of your development server
16- The field might be accessible in another subfield, please try your query in GraphiQL and use the GraphiQL explorer to see which fields you can query and what shape they have
17- You want to optionally use your field "allContentfulBlogPost" and right now it is not used anywhere. Therefore Gatsby can't infer the type and add it to the GraphQL schema. A quick fix is to add at least one entry with that field
18("dummy content")
19
20It is recommended to explicitly type your GraphQL schema if you want to use optional fields. This way you don't have to add the mentioned "dummy content". Visit our docs to learn how you can define the schema for "Query":
21https://www.gatsbyjs.org/docs/schema-customization/#creating-type-definitions
22
23File: gatsby-node.js:7:10
24
25[
26  GraphQLError: Cannot query field "allContentfulBlogPost" on type "Query". Did you mean "allContentfulBlog", "allContentfulAsset", "contentfulBlog", "contentfulAsset", or "allContentfulContentType"?
27      at Object.Field (/Users/xxxx/gatsbyjs-and-contentful/node_modules/graphql/validation/rules/FieldsOnCorrectType.js:53:31)
28      at Object.enter (/Users/xxxx/gatsbyjs-and-contentful/node_modules/graphql/language/visitor.js:324:29)
29      at Object.enter (/Users/xxxx/gatsbyjs-and-contentful/node_modules/graphql/language/visitor.js:375:25)
30      at visit (/Users/xxxx/gatsbyjs-and-contentful/node_modules/graphql/language/visitor.js:242:26)
31      at validate (/Users/xxxx/gatsbyjs-and-contentful/node_modules/graphql/validation/validate.js:73:24)
32      at GraphQLRunner.validate (/Users/xxxx/gatsbyjs-and-contentful/node_modules/gatsby/src/query/graphql-runner.ts:98:22)
33      at GraphQLRunner.query (/Users/xxxx/gatsbyjs-and-contentful/node_modules/gatsby/src/query/graphql-runner.ts:162:25)
34      at /Users/xxxx/gatsbyjs-and-contentful/node_modules/gatsby/src/bootstrap/create-graphql-runner.ts:59:8
35      at /Users/xxxx/gatsbyjs-and-contentful/gatsby-node.js:10:7
36      at Promise._execute (/Users/xxxx/gatsbyjs-and-contentful/node_modules/bluebird/js/release/debuggability.js:384:9)
37      at Promise._resolveFromExecutor (/Users/xxxx/gatsbyjs-and-contentful/node_modules/bluebird/js/release/promise.js:518:18)
38      at new Promise (/Users/xxxx/gatsbyjs-and-contentful/node_modules/bluebird/js/release/promise.js:103:10)
39      at Object.exports.createPages (/Users/xxxx/gatsbyjs-and-contentful/gatsby-node.js:7:10)
40      at runAPI (/Users/xxxx/gatsbyjs-and-contentful/node_modules/gatsby/src/utils/api-runner-node.js:485:22)
41      at Promise.catch.decorateEvent.pluginName (/Users/xxxx/gatsbyjs-and-contentful/node_modules/gatsby/src/utils/api-runner-node.js:636:13)
42      at Promise._execute (/Users/xxxx/gatsbyjs-and-contentful/node_modules/bluebird/js/release/debuggability.js:384:9) {
43    locations: [ [Object] ]
44  }
45]
46
47 ERROR 
48
49(node:36842) Warning: a promise was rejected with a non-error: [object Array]
50(Use `node --trace-warnings ...` to show where the warning was created)
51
52
53 ERROR #11321  PLUGIN
54
55"gatsby-node.js" threw an error while running the createPages lifecycle:
56
57Cannot read property 'allContentfulBlogPost' of undefined
58
59  27 |         }
60  28 |
61> 29 |         const posts = result.data.allContentfulBlogPost.edges
62     |                                   ^
63  30 |         posts.forEach((post, index) => {
64  31 |           createPage({
65  32 |             path: `/blog/${post.node.slug}/`,
66
67File: gatsby-node.js:29:35
68
69
70...
71...
72...
73
74File: src/templates/blog-post.js:56:5
75
76failed extract queries from components - 1.151s
77success write out requires - 0.016s
78success run page queries - 0.063s - 1/1 15.86/s
79
80 ERROR #98124  WEBPACK
81
82Generating development JavaScript bundle failed
83
84Can't resolve 'core-js/modules/web.dom.iterable.js' in '/Users/xxxx/gatsbyjs-and-contentful/.cache'
85
86If you're trying to use a package make sure that 'core-js/modules/web.dom.iterable.js' is installed. If you're trying to use a local file make sure that the path is correct.
87
88File: .cache/app.js
89
90
91 ERROR #98124  WEBPACK
92
93Generating development JavaScript bundle failed
94
95Can't resolve 'core-js/modules/web.dom.iterable.js' in '/Users/xxxx/gatsbyjs-and-contentful/.cache'
96
97If you're trying to use a package make sure that 'core-js/modules/web.dom.iterable.js' is installed. If you're trying to use a local file make sure that the path is correct.
98
99File: .cache/dev-loader.js
100
101
102 ERROR #98124  WEBPACK
103
104Generating development JavaScript bundle failed
105
106Can't resolve 'core-js/modules/web.dom.iterable.js' in '/Users/xxxx/gatsbyjs-and-contentful/.cache'
107
108If you're trying to use a package make sure that 'core-js/modules/web.dom.iterable.js' is installed. If you're trying to use a local file make sure that the path is correct.
109
110File: .cache/loader.js
111
112
113 ERROR #98124  WEBPACK
114
115Generating development JavaScript bundle failed
116
117Can't resolve 'core-js/modules/web.dom.iterable.js' in '/Users/xxxx/gatsbyjs-and-contentful/.cache'
118
119If you're trying to use a package make sure that 'core-js/modules/web.dom.iterable.js' is installed. If you're trying to use a local file make sure that the path is correct.
120
121File: .cache/find-path.js
122
123
124 ERROR #98124  WEBPACK
125
126Generating development JavaScript bundle failed
127
128Can't resolve 'core-js/modules/web.dom.iterable.js' in '/Users/xxxx/gatsbyjs-and-contentful/.cache'
129
130If you're trying to use a package make sure that 'core-js/modules/web.dom.iterable.js' is installed. If you're trying to use a local file make sure that the path is correct.
131
132File: .cache/navigation.js
133
134failed Building development bundle - 12.307s