How to restart discourse on EC2

Once I succeed to install discourse on EC2 manually , I shutted down EC2 and reboot them.

But I couldn’t access previous site. and I searched and tried

/var/discourse # ./launcher start app

I encountered some error message like below.

starting up existing container

+ /usr/bin/docker start app

Error response from daemon: driver failed programming external connectivity on endpoint app (): Error starting userland proxy: listen tcp 0.0.0.0:80: bind: address already in use

Error: failed to start containers: app

As I am beginer,I would like to know reference page.If you have any information, please let me know.

Thanks

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