App.yml 未显示内容

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File 'containers/app.yml' is unwritable

I am following this guide to install discourse on AWS EC2 instance. Completed all the steps except Elasticache (not using separate Redis). After finishing the discourse setup, I need to edit my app.yml for change in RDS and SMTP settings. But it’s showing that File ‘containers/app.yml’ is unwritable. Has anyone faced this issue? How to resolve this?