ブログパーツの編集や新規作成を使用とすると画像のように「エディターで予期しないエラーが発生しました。」と表示され、使えなくなってしまいました。

復旧を試みる　をしても特に反応がありません。

タイミング的には、ブログパーツを編集中に右上のSWELLマークの横のメールのマークを触ってしまった際にエラーの画面になり、その後かわりません。

同様の正常に動いているテストサイトがあるため、All-in-One WP Migrationにて、インポートしたんのですが変わりませんでした。

エラー分は以下の通りとなります。

どうすればよいでしょうか？よろしくお願いいたします。

Error: An error occurred while running 'mapSelect': Cannot read property '_s2mail' of undefined
The error may be correlated with this previous error:
TypeError: Cannot read property '_s2mail' of undefined
at https://b-reserve.net/blog/wp-content/plugins/subscribe2/gutenberg/sidebar.min.js?ver=1.1:1:754
at Object.current ( https://b-reserve.net/blog/wp-includes/js/dist/data.min.js?ver=943087ae96d075f126df689839bb96b9:2:31396)
at https://b-reserve.net/blog/wp-includes/js/dist/data.min.js?ver=943087ae96d075f126df689839bb96b9:2:30908
at s ( https://b-reserve.net/blog/wp-includes/js/dist/data.min.js?ver=943087ae96d075f126df689839bb96b9:2:25154)
at Object.__experimentalMarkListeningStores ( https://b-reserve.net/blog/wp-includes/js/dist/data.min.js?ver=943087ae96d075f126df689839bb96b9:2:25561)
at https://b-reserve.net/blog/wp-includes/js/dist/data.min.js?ver=943087ae96d075f126df689839bb96b9:2:30208
at e ( https://b-reserve.net/blog/wp-includes/js/dist/data.min.js?ver=943087ae96d075f126df689839bb96b9:2:30885)
at https://b-reserve.net/blog/wp-includes/js/dist/data.min.js?ver=943087ae96d075f126df689839bb96b9:2:31020
at Bh ( https://b-reserve.net/blog/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.13.1:126:456)
at oj ( https://b-reserve.net/blog/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.13.1:126:549)

Original stack trace:
at Ge ( https://b-reserve.net/blog/wp-includes/js/dist/data.min.js?ver=943087ae96d075f126df689839bb96b9:2:30611)
at https://b-reserve.net/blog/wp-includes/js/dist/data.min.js?ver=943087ae96d075f126df689839bb96b9:2:31371
at we ( https://b-reserve.net/blog/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.13.1:84:293)
at He ( https://b-reserve.net/blog/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.13.1:97:464)
at zj ( https://b-reserve.net/blog/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.13.1:228:406)
at Th ( https://b-reserve.net/blog/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.13.1:152:223)
at tj ( https://b-reserve.net/blog/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.13.1:152:152)
at Te ( https://b-reserve.net/blog/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.13.1:146:151)
at https://b-reserve.net/blog/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.13.1:61:68
at unstable_runWithPriority ( https://b-reserve.net/blog/wp-includes/js/dist/vendor/react.min.js?ver=16.13.1:25:260)