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Attempted to load class “WebProfilerBundle” from namespace “Symfony\Bundle\WebProfilerBundle” when deploying on Heroku using development dependencies

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问题 We have a Symfony 4.3 web application hosted on Heroku. This is a new setup and we never managed to have the dev mode to work correctly . There are plenty of similar issues online but none fixes the exact symptoms we are facing here. The project was created with a command line: composer create-project symfony/website-skeleton appName Let me clarify that: we do not want to change from "dev" to "prod" We need to be able to use the application in dev mode in order to take advantage of error

How to deploy React application to Heroku

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问题 I have built a single-page weather app with React and Node.js but can't seem to get it to deploy to Heroku. So far, I have: Created a new app on Heroku called weather-app-react-node Logged into Heroku on the CLI Run the command 'heroku git:remote -a weather-app-react-node' in my terminal Added a Procfile with 'web: npm start' in it Ran 'git add .', 'git commit -m "Pushed to heroku"', 'git push heroku master' My terminal tells me it is deployed and waiting but when I click on the link, I get

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