このエラーメッセージに関する原因と対処に関して説明します。
エラーメッセージ(英語)：
typeerror cannot delete property
対処
関連リンク
TypeError: can't delete non-configurable array element - MDNdeveloper.mozilla.org/.../JavaScript/.../Non_configurabl...
https://developer.mozilla.org/ja/docs/Web/JavaScript/Reference/Errors/Non_configurable_array_element・・・
is non-configurable and can't be deleted - MDN - Mozilladeveloper.mozilla.org/ja/docs/.../JavaScript/.../Cant_dele...
https://developer.mozilla.org/ja/docs/Web/JavaScript/Reference/Errors/Cant_delete
JavaScript "typeerror cannot delete property"のヤフオク!検索結果（343件）ヤフオク!
https://auctions.yahoo.co.jp/search/search?rkf=2&p=JavaScript+%22typeerror+cannot+delete+property%22・・・