How to fix Google YouTube “400. That’s an error.” 開発 2018.04.03 How to fix on Google Chrome. 目次 Right-click on error page and click “Inspect”.Click “Application”Right-click on “https://www.youtube.com” in “Storage” – “Cookies” and click “Clear”. Right-click on error page and click “Inspect”. Click “Application” Right-click on “https://www.youtube.com” in “Storage” – “Cookies” and click “Clear”. English 日本語