Failed to install Jabref word add-in (Error yarn install)

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I have a problem with the installation of the Word Desktop add-in jabref. when I try to install Yarn on CMD it fails as shown below.

C:\Windows\system32>cd C:\JabRef-Word-Addin-main

C:\JabRef-Word-Addin-main>yarn config set network-timeout 600000 -g
yarn config v1.22.19
success Set "network-timeout" to "600000".
Done in 0.26s.

C:\JabRef-Word-Addin-main>yarn install
yarn install v1.22.19
[1/4] Resolving packages...
[2/4] Fetching packages...
[3/4] Linking dependencies...
warning "@graphql-codegen/cli > cosmiconfig-typescript-loader@4.0.0" has unmet peer dependency "@types/node@*".
warning "@graphql-codegen/cli > cosmiconfig-typescript-loader@4.0.0" has unmet peer dependency "ts-node@>=10".
warning "@graphql-codegen/cli > graphql-config > ts-node@10.9.1" has unmet peer dependency "@types/node@*".
warning " > @graphql-codegen/typescript-react-apollo@3.3.3" has unmet peer dependency "graphql-tag@^2.0.0".
warning " > postcss-loader@4.3.0" has unmet peer dependency "postcss@^7.0.0 || ^8.0.1".
[4/4] Building fresh packages...
$ yarn generate && crlf --set=LF node_modules/.bin/office-addin-*
yarn run v1.22.19
$ graphql-codegen --config codegen.yml
√ Parse Configuration
‼ Generate outputs
  > Generate to src/generated/graphql.ts
    ×
            Failed to load schema from https://jabref-online.herokuapp.com/api:

            Unexpected token < in JSO…
    ■ Load GraphQL documents
    ■ Generate
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/install for documentation about this command.

C:\JabRef-Word-Addin-main>