`AttributeError: 'NoneType' object has no attribute 'api_type'` !

[Hongcheng-Gao]

When i running python -m examples.aflow.optimize --dataset MATH, it appear AttributeError: 'NoneType' object has no attribute 'api_type'

[shenchucheng]

The models have not been configured. Please follow the instructions at https://github.com/geekan/MetaGPT/tree/main/examples/aflow#quick-start to complete the configuration and then try again.

[shenchucheng]

The merged PR #1632 raises exceptions more elegantly and introduces the --opt_model_name and --exec_model_name options to allow the passing of custom models.