Assertion Error: We couldn't find your 'app'. Please refer to the Manual.

[DasonT]

I am trying to run a Python script but it says: Assertion Error: We couldn't find your 'app'. Please refer to the Manual.

Here is the stack trace:
File "/opt/python/detalib/debugger.py", line 131, in wrap
return func(event, context)

File "/var/task/_entry.py", line 14, in handler
return handle(event, main)

File "/opt/python/detalib/handler.py", line 8, in handle
assert hasattr(

Is there any solution to this? Thank you!