When running the image in docker throws an error

[classyKSC]

C:\Windows\System32\my-webapp>docker run -p 8080:8080 my-webapp

• Serving Flask app 'app.py' (lazy loading)
• Environment: production
  WARNING: This is a development server. Do not use it in a production deployment.
  Use a production WSGI server instead.
• Debug mode: off
  Usage: flask run [OPTIONS]
  Try 'flask run --help' for help.

Error: Could not import 'app'.

[chaurasia-namrata]

@mmumshad getting the same error while running FLASK_APP=app.py flask run --host=0.0.0.0 command.

When tried running this command FLASK_APP=app.py FLASK_ENV=development DEBUG=True flask run got error as below

 * Environment: development
 * Debug mode: on
Usage: flask run [OPTIONS]
Try 'flask run --help' for help.

Error: While importing 'app', an ImportError was raised.

kindly help.