gunicorn.errors.HaltServer: django

Actually the problem here was the wsgi file itself, previously before django 1.3 the wsgi file was named with an extension of .wsgi, but now in the recent versions it will be created with and extension of .py that is the wsgi file must be a python module

so the file should be hello_wsgi.py and command should be

gunicorn  hello:application -b xx.xxx.xxx.xx:8000

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