RuntimeError: no validator found for <class '__main__.Node'>, see `arbitrary_types_allowed` in Config

[LINYiyangCUHK]

RuntimeError: no validator found for <class 'main.Node'>, see arbitrary_types_allowed in Config

[Jiancong]

RuntimeError: no validator found for <class 'main.Node'>, see arbitrary_types_allowed in Config

Add following code snippit

class BaseModel(PydanticBaseModel):
    class Config:
        arbitrary_types_allowed = True