Demo cant be found - why?

[evanerwee]

Mounting C:\SAMDev\sam-python-with-layers-master.aws-sam\build\Function as /var/task:ro,delegated inside runtime container
START RequestId: 07db4a3d-5d38-1ae9-0a34-7da95408b078 Version: $LATEST
[ERROR] Runtime.ImportModuleError: Unable to import module 'app': No module named 'demo'
END RequestId: 07db4a3d-5d38-1ae9-0a34-7da95408b078