Unable to deploy Django app in Heroku due to requirements.txt error - django

Question

I am trying to deploy a django app I created to heroku. When i do git push heroku master an error shows remote: cp: cannot create regular file '/app/tmp/cache/.heroku/requirements.txt': No such file or directory.
here is the full log:
Enumerating objects: 35, done.
Counting objects: 100% (35/35), done.
Delta compression using up to 2 threads
Compressing objects: 100% (32/32), done.
Writing objects: 100% (35/35), 12.68 KiB | 405.00 KiB/s, done.
Total 35 (delta 2), reused 0 (delta 0)
remote: Compressing source files... done.
remote: Building source:
remote:
remote: -----> Python app detected
remote: cp: cannot create regular file '/app/tmp/cache/.heroku/requirements.txt': No such file or directory
remote: -----> Installing python-3.6.10
remote: -----> Installing pip
remote: -----> Installing SQLite3
remote: Sqlite3 successfully installed.
remote: -----> Installing requirements with pip
remote: Collecting asgiref==3.2.7
remote: Downloading asgiref-3.2.7-py2.py3-none-any.whl (19 kB)
remote: Collecting astroid==2.3.3
remote: Downloading astroid-2.3.3-py3-none-any.whl (205 kB)
remote: Collecting colorama==0.4.3
remote: Downloading colorama-0.4.3-py2.py3-none-any.whl (15 kB)
remote: Collecting dj-database-url==0.5.0
remote: Downloading dj_database_url-0.5.0-py2.py3-none-any.whl (5.5 kB)
remote: Collecting Django==3.0.5
remote: Downloading Django-3.0.5-py3-none-any.whl (7.5 MB)
remote: Collecting django-heroku==0.3.1
remote: Downloading django_heroku-0.3.1-py2.py3-none-any.whl (6.2 kB)
remote: Collecting gunicorn==20.0.4
remote: Downloading gunicorn-20.0.4-py2.py3-none-any.whl (77 kB)
remote: Collecting isort==4.3.21
remote: Downloading isort-4.3.21-py2.py3-none-any.whl (42 kB)
remote: Collecting lazy-object-proxy==1.4.3
remote: Downloading lazy_object_proxy-1.4.3-cp36-cp36m-manylinux1_x86_64.whl (55 kB)
remote: Collecting mccabe==0.6.1
remote: Downloading mccabe-0.6.1-py2.py3-none-any.whl (8.6 kB)
remote: Collecting psycopg2==2.8.5
remote: Downloading psycopg2-2.8.5.tar.gz (380 kB)
remote: Collecting pylint==2.4.4
remote: Downloading pylint-2.4.4-py3-none-any.whl (302 kB)
remote: Collecting pytz==2019.3
remote: Downloading pytz-2019.3-py2.py3-none-any.whl (509 kB)
remote: Collecting six==1.14.0
remote: Downloading six-1.14.0-py2.py3-none-any.whl (10 kB)
remote: Collecting sqlparse==0.3.1
remote: Downloading sqlparse-0.3.1-py2.py3-none-any.whl (40 kB)
remote: Collecting typed-ast==1.4.1
remote: Downloading typed_ast-1.4.1-cp36-cp36m-manylinux1_x86_64.whl (737 kB)
remote: Collecting whitenoise==5.0.1
remote: Downloading whitenoise-5.0.1-py2.py3-none-any.whl (20 kB)
remote: Collecting wrapt==1.11.2
remote: Downloading wrapt-1.11.2.tar.gz (27 kB)
remote: Building wheels for collected packages: psycopg2, wrapt
remote: Building wheel for psycopg2 (setup.py): started
remote: Building wheel for psycopg2 (setup.py): finished with status 'done'
remote: Created wheel for psycopg2: filename=psycopg2-2.8.5-cp36-cp36m-linux_x86_64.whl size=447249 sha256=8c3101c70eafd1ccd9ef08021cf553d3c10d55ac62b1c191b19735ab3c026e5a
remote: Stored in directory: /tmp/pip-ephem-wheel-cache-025326ex/wheels/52/9a/ab/22a0d1dc560ad5c0d09cc1c968015f89726e7e01c190dee110
remote: Building wheel for wrapt (setup.py): started
remote: Building wheel for wrapt (setup.py): finished with status 'done'
remote: Created wheel for wrapt: filename=wrapt-1.11.2-cp36-cp36m-linux_x86_64.whl size=69767 sha256=974a65540f5d88c324d2c7cd1c4379cbaa7e2c1a03e599864be4c2ffbe4e17af
remote: Stored in directory: /tmp/pip-ephem-wheel-cache-025326ex/wheels/0d/85/48/15d7bfab92a2d0e87372224c1f628fc57db7447a663a58e86c
remote: Successfully built psycopg2 wrapt
remote: Installing collected packages: asgiref, lazy-object-proxy, typed-ast, six, wrapt, astroid, colorama, dj-database-url, sqlparse, pytz, Django, psycopg2, whitenoise, django-heroku, gunicorn, isort, mccabe, pylint
remote: Successfully installed Django-3.0.5 asgiref-3.2.7 astroid-2.3.3 colorama-0.4.3 dj-database-url-0.5.0 django-heroku-0.3.1 gunicorn-20.0.4 isort-4.3.21 lazy-object-proxy-1.4.3 mccabe-0.6.1 psycopg2-2.8.5 pylint-2.4.4 pytz-2019.3 six-1.14.0 sqlparse-0.3.1 typed-ast-1.4.1 whitenoise-5.0.1 wrapt-1.11.2
remote: -----> $ python manage.py collectstatic --noinput
remote: Traceback (most recent call last):
remote: File "manage.py", line 21, in <module>
remote: main()
remote: File "manage.py", line 17, in main
remote: execute_from_command_line(sys.argv)
remote: File "/app/.heroku/python/lib/python3.6/site-packages/django/core/management/__init__.py", line 401, in execute_from_command_line
remote: utility.execute()
remote: File "/app/.heroku/python/lib/python3.6/site-packages/django/core/management/__init__.py", line 395, in execute
remote: self.fetch_command(subcommand).run_from_argv(self.argv)
remote: File "/app/.heroku/python/lib/python3.6/site-packages/django/core/management/base.py", line 328, in run_from_argv
remote: self.execute(*args, **cmd_options)
remote: File "/app/.heroku/python/lib/python3.6/site-packages/django/core/management/base.py", line 369, in execute
remote: output = self.handle(*args, **options)
remote: File "/app/.heroku/python/lib/python3.6/site-packages/django/contrib/staticfiles/management/commands/collectstatic.py", line 187, in handle
remote: collected = self.collect()
remote: File "/app/.heroku/python/lib/python3.6/site-packages/django/contrib/staticfiles/management/commands/collectstatic.py", line 104, in collect
remote: for path, storage in finder.list(self.ignore_patterns):
remote: File "/app/.heroku/python/lib/python3.6/site-packages/django/contrib/staticfiles/finders.py", line 130, in list
remote: for path in utils.get_files(storage, ignore_patterns):
remote: File "/app/.heroku/python/lib/python3.6/site-packages/django/contrib/staticfiles/utils.py", line 23, in get_files
remote: directories, files = storage.listdir(location)
remote: File "/app/.heroku/python/lib/python3.6/site-packages/django/core/files/storage.py", line 316, in listdir
remote: for entry in os.scandir(path):
remote: FileNotFoundError: [Errno 2] No such file or directory: '/tmp/build_8b272f59d204dc1b5699579647b39ae3/static_in_env'
remote:
remote: ! Error while running '$ python manage.py collectstatic --noinput'.
remote: See traceback above for details.
remote:
remote: You may need to update application code to resolve this error.
remote: Or, you can disable collectstatic for this application:
remote:
remote: $ heroku config:set DISABLE_COLLECTSTATIC=1
remote:
remote: https://devcenter.heroku.com/articles/django-assets
remote: ! Push rejected, failed to compile Python app.
remote:
remote: ! Push failed
remote: Verifying deploy...
remote:
remote: ! Push rejected to pure-plains-36964.
remote:
To https://git.heroku.com/pure-plains-36964.git
! [remote rejected] master -> master (pre-receive hook declined)
error: failed to push some refs to 'https://git.heroku.com/pure-plains-36964.git'
I do have requirements.txt in my root directory with everything included. Please help

Answer 1

There is indeed a requirements.txt error but that does not stop the build.
The error is something with your django collectstatic. Might be because you have an empty folder in called static_in_env. You may follow the recommendation in the stack trace, i.e. run:
$ heroku config:set DISABLE_COLLECTSTATIC=1
But if you need the collectstatic to run then revert that flag:
$ heroku config:set DISABLE_COLLECTSTATIC=0
and then debug why it is empty. It is hard to tell without more context.
As for the requirements.txt, make sure you only have one requirements.txt. If you have more than one, make sure they all have some text in them. Hope this helps.