error: [Errno 98] Address already in use
Looks like you're calling run:flaskapp instead of app:flaskapp and run.py is trying to open another instance.
16:35:44 web.1 | File "/home/adminuser/Desktop/Github/SoftwareEng/barcodeServer/SoftwareEng/run.py", line 3, in <module>First, always encapsulate the run:
if __name__ == '__main__': flaskapp.run(debug=True)And update your procfile to call the app.__init__.py instead:
web: gunicorn app:flaskapp --log-file=-PS: I don't know what procfile or foreman are -- heroku things?