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)：
cloud9 permission denied
対処
関連リンク
Access Permissions Reference for AWS Cloud9 - AWS Cloud9
https://docs.aws.amazon.com/cloud9/latest/user-guide/auth-and-access-control.html
AWS Developer Forums: Cloud9 setup, Error & cant save ...
https://forums.aws.amazon.com/thread.jspa?messageID=822023&tstart=0
AWS Cloud9 のトラブルシューティング - AWS Cloud9 - Amazon.com
https://docs.aws.amazon.com/ja_jp/cloud9/latest/user-guide/troubleshooting.html
AWS Cloud9 のアクセス権限リファレンス - AWS Cloud9
https://docs.aws.amazon.com/ja_jp/cloud9/latest/user-guide/auth-and-access-control.html
Troubleshooting AWS Cloud9 - AWS Cloud9 - AWS Documentation
https://docs.aws.amazon.com/cloud9/latest/user-guide/troubleshooting.html
Cannot Open an Environment
https://docs.aws.amazon.com/cloud9/latest/user-guide/troubleshooting.html#troubleshooting-env-loadin・・・
Application Preview Tab ...
https://docs.aws.amazon.com/cloud9/latest/user-guide/troubleshooting.html#troubleshooting-app-previe・・・
Cannot Display Your ...
https://docs.aws.amazon.com/cloud9/latest/user-guide/troubleshooting.html#troubleshooting-app-sharin・・・
Permission denied - Cloud9 Support - Cloud9 Community
https://community.c9.io/t/permission-denied/4541
AWS Cloud9上でPython3 + Django + MySQL環境を構築する手順 - Qiita
https://qiita.com/sikkim/items/bb9ee5ef747660f84774