I have created backend with perfectswift. Now I am trying to deploy that with heroku but I am getting some kind of error while pushing. Help me to solve this issue.

I have created backend with perfectswift. Now I am trying to deploy that with heroku but I am getting some kind of error while pushing. Help me to solve this issue.

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Seems to be an issue related with stack compatibility. You need to downgrade your stack:
If you got that warning, means you'll need to use Cedar-14:
List of Heroku's stacks:
https://devcenter.heroku.com/articles/stack