Migrating from Flask-Script to Flask-CLI

I am migrating from Flask-Script to Flask-CLI with the latest Flask version. Here are what my manage.py and migrate.py file look like.
I am getting this error#

app 
Traceback (most recent call last):
File "manage. py", line 19, in
<module>
cli()
File "/usr/local/lib/python3.7/site-packages/click/core. py", line 1130, in __call__
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app
return self.main(*args, **kwargs)
File "/usr/local/lib/python3.7/site-packages/flask/cli.py", line 579, in main
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app 
return super().main(*args, **kwargs)
File "/usr/local/lib/python3.7/site-packages/click/core. py", line 1055, in main
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app
rv = self.invoke(ctx)
File "/usr/local/lib/python3.7/site-packages/click/core. py", line 1657, in invoke

Please help thanks!