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)：
create cookie not working
対処
関連リンク
JavaScript Cookies are not being set - Stack Overflowstackoverflow.com/.../javascript-cookies-are-not-being-...
https://stackoverflow.com/questions/8097423/javascript-cookies-are-not-being-set
Why would setting document.cookie not work ...
https://stackoverflow.com/questions/26349052/why-would-setting-document-cookie-not-work-in-chrome
JavaScript code for cookie not working in Chrome
https://stackoverflow.com/questions/15385641/javascript-code-for-cookie-not-working-in-chrome