NO_PROGRAM
What happened
A file must define one class that subclasses fg.Strategy, or be a library that lists its public names in __all__. This one is neither.
What to do
Define a strategy class, or add an __all__ list of the names the file offers.
Example
text
strategy.py, line 1: Define one class that subclasses fg.Strategy, or list a library's public names in __all__. [NO_PROGRAM]The wording of the message depends on your file, and the code does not. An error stops the file from loading.