I was getting same error for a react app templated by create-react-app.
I resolved it by changing buildpack to github.com/mars/create-react-app-b... .
Above build pack is required for create-react-app template (static sites).
In Heroku dashboard, under settings> buildpack - I changed from node build pack to github.com/mars/create-react-app-b... and then react static web page started working (buildpack can be set via Heroku CLI also).
If your app is involving, node backend , then checkout github.com/mars/heroku-cra-node .
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I was getting same error for a react app templated by create-react-app.
I resolved it by changing buildpack to github.com/mars/create-react-app-b... .
Above build pack is required for create-react-app template (static sites).
In Heroku dashboard, under settings> buildpack - I changed from node build pack to github.com/mars/create-react-app-b... and then react static web page started working (buildpack can be set via Heroku CLI also).
If your app is involving, node backend , then checkout github.com/mars/heroku-cra-node .