sushan-upadhyay opened a new issue #6543: flask.cli.NoAppException on fresh 
installation of superset via docker
URL: https://github.com/apache/incubator-superset/issues/6543
 
 
   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.
   
   <pre>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.
   </pre>
   
   Issue #6505 looks similar and installing python-dotenv resolved the issue. 
   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
   
   
![image](https://user-images.githubusercontent.com/39080326/50059501-b5a57400-01ad-11e9-9f53-453ef9046fc5.png)
   

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