flask.cli.NoAppException on fresh installation of superset via docker

I’m trying to install superset using docker and followed the instructions mentioned in installation.rst After running docker-compose up and opening http://localhost:8088 I’m getting following error.

Traceback (most recent call last):
  File "/usr/local/lib/python3.6/site-packages/flask/cli.py", line 95, in find_best_app
    module=module.__name__
flask.cli.NoAppException: Failed to find Flask application or factory in module "app". Use "FLASK_APP=app:name to specify one.

Issue #6505 looks similar and installing python-dotenv resolved the issue for it. I checked the requirements-dev.txt file and it mentions python-dotenv and I assume same has been installed. I’m not very familiar with docker and not sure how to proceed.

Thanks

[kiryaka]

@sushan-upadhyay , @krdeepak Are you guys sure you rebuilt docker without a cache and not just pop it up from docker images? sudo docker-compose build --no-cache superset - should do the job, but to be 100% sure do also try docker rm on the container, docker rmi on the image

[kiryaka]

@lhyundeadsoul, Thank you that works for me also!

@MarcusSorealheis, didn’t solve it for my case

contrib/docker$ sudo docker-compose build --no-cache superset
...
Collecting python-dotenv==0.10.1 (from -r requirements-dev.txt (line 2))
  Downloading https://files.pythonhosted.org/packages/8c/14/501508b016e7b1ad0eb91bba581e66ad9bfc7c66fcacbb580eaf9bc38458/python_dotenv-0.10.1-py2.py3-none-any.whl
...
superset_1  | Traceback (most recent call last):
superset_1  |   File "/usr/local/lib/python3.6/site-packages/flask/cli.py", line 330, in __call__
superset_1  |     rv = self._load_unlocked()
superset_1  |   File "/usr/local/lib/python3.6/site-packages/flask/cli.py", line 317, in _load_unlocked
superset_1  |     self._app = rv = self.loader()
superset_1  |   File "/usr/local/lib/python3.6/site-packages/flask/cli.py", line 384, in load_app
superset_1  |     'Could not locate a Flask application. You did not provide '
superset_1  | flask.cli.NoAppException: Could not locate a Flask application. You did not provide the "FLASK_APP" environment variable, and a "wsgi.py" or "app.py" module was not found in the current directory.