yarn set version stable
実行時エラー
$ yarn set version stable
warning package.json: No license field
Resolving stable to a url...
error An unexpected error occurred: "Release not found: stable".
info If you think this is a bug, please open a bug report with the information provided in "/../../yarn-error.log".
info Visit https://yarnpkg.com/en/docs/cli/policies for documentation about this command.
解決策
yarn set version berry
を実行する
$ yarn set version berry