Your WSGIPath refers to a file that does not exist

I'm trying to upload my Flask application to AWS however I receive an error on doing so:

Your WSGIPath refers to a file that does not exist.

After doing some digging online I found that in the .ebextensions file, I should specify the path. There was not a .ebextensions file so I created one and added the following code:

option_settings:
  "aws:elasticbeanstalk:container:python":
    WSGIPath: project/application.py

the WSGIPath is the correct path to the application.py file so I'm not sure what raises this error. Am I changing the WSGIPath right, is there a better way or is there an issue with something else which causes this to happen? Thanks.