If you got this error by calling handler(<some type>) within `__get_pydantic_core_schema__` then you likely need to call

When I used gradio to inference, it raise a Error.
System: ubunt 20.04

ERROR: Exception in ASGI application
Traceback (most recent call last):
File "/home/yunkai/miniconda3/envs/megatts3-env/lib/python3.9/site-packages/pydantic/type_adapter.py", line 270, in _init_core_attrs
self.core_schema = _getattr_no_parents(self._type, '__pydantic_core_schema__')
File "/home/yunkai/miniconda3/envs/megatts3-env/lib/python3.9/site-packages/pydantic/type_adapter.py", line 55, in _getattr_no_parents
raise AttributeError(attribute)
AttributeError: __pydantic_core_schema__

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/home/yunkai/miniconda3/envs/megatts3-env/lib/python3.9/site-packages/uvicorn/protocols/http/h11_impl.py", line 403, in run_asgi
result = await app( # type: ignore[func-returns-value]
File "/home/yunkai/miniconda3/envs/megatts3-env/lib/python3.9/site-packages/uvicorn/middleware/proxy_headers.py", line 60, in __call__
return await self.app(scope, receive, send)
File "/home/yunkai/miniconda3/envs/megatts3-env/lib/python3.9/site-packages/fastapi/applications.py", line 1054, in __call__
await super().__call__(scope, receive, send)
File "/home/yunkai/miniconda3/envs/megatts3-env/lib/python3.9/site-packages/starlette/applications.py", line 112, in __call__
await self.middleware_stack(scope, receive, send)
File "/home/yunkai/miniconda3/envs/megatts3-env/lib/python3.9/site-packages/starlette/middleware/errors.py", line 187, in __call__
raise exc
File "/home/yunkai/miniconda3/envs/megatts3-env/lib/python3.9/site-packages/starlette/middleware/errors.py", line 165, in __call__
await self.app(scope, receive, _send)
File "/home/yunkai/miniconda3/envs/megatts3-env/lib/python3.9/site-packages/starlette/middleware/cors.py", line 93, in __call__
await self.simple_response(scope, receive, send, request_headers=headers)
File "/home/yunkai/miniconda3/envs/megatts3-env/lib/python3.9/site-packages/starlette/middleware/cors.py", line 144, in simple_response
await self.app(scope, receive, send)
File "/home/yunkai/miniconda3/envs/megatts3-env/lib/python3.9/site-packages/starlette/middleware/exceptions.py", line 62, in __call__
await wrap_app_handling_exceptions(self.app, conn)(scope, receive, send)
File "/home/yunkai/miniconda3/envs/megatts3-env/lib/python3.9/site-packages/starlette/_exception_handler.py", line 53, in wrapped_app
raise exc
File "/home/yunkai/miniconda3/envs/megatts3-env/lib/python3.9/site-packages/starlette/_exception_handler.py", line 42, in wrapped_app
await app(scope, receive, sender)
File "/home/yunkai/miniconda3/envs/megatts3-env/lib/python3.9/site-packages/starlette/routing.py", line 714, in __call__
await self.middleware_stack(scope, receive, send)
File "/home/yunkai/miniconda3/envs/megatts3-env/lib/python3.9/site-packages/starlette/routing.py", line 734, in app
await route.handle(scope, receive, send)
File "/home/yunkai/miniconda3/envs/megatts3-env/lib/python3.9/site-packages/starlette/routing.py", line 288, in handle
await self.app(scope, receive, send)
File "/home/yunkai/miniconda3/envs/megatts3-env/lib/python3.9/site-packages/starlette/routing.py", line 76, in app
await wrap_app_handling_exceptions(app, request)(scope, receive, send)
File "/home/yunkai/miniconda3/envs/megatts3-env/lib/python3.9/site-packages/starlette/_exception_handler.py", line 53, in wrapped_app
raise exc
File "/home/yunkai/miniconda3/envs/megatts3-env/lib/python3.9/site-packages/starlette/_exception_handler.py", line 42, in wrapped_app
await app(scope, receive, sender)
File "/home/yunkai/miniconda3/envs/megatts3-env/lib/python3.9/site-packages/starlette/routing.py", line 73, in app
response = await f(request)
File "/home/yunkai/miniconda3/envs/megatts3-env/lib/python3.9/site-packages/fastapi/routing.py", line 291, in app
solved_result = await solve_dependencies(
File "/home/yunkai/miniconda3/envs/megatts3-env/lib/python3.9/site-packages/fastapi/dependencies/utils.py", line 666, in solve_dependencies
) = await request_body_to_args( # body_params checked above
File "/home/yunkai/miniconda3/envs/megatts3-env/lib/python3.9/site-packages/fastapi/dependencies/utils.py", line 899, in request_body_to_args
fields_to_extract = get_cached_model_fields(first_field.type_)
File "/home/yunkai/miniconda3/envs/megatts3-env/lib/python3.9/site-packages/fastapi/_compat.py", line 659, in get_cached_model_fields
return get_model_fields(model)
File "/home/yunkai/miniconda3/envs/megatts3-env/lib/python3.9/site-packages/fastapi/_compat.py", line 285, in get_model_fields
return [
File "/home/yunkai/miniconda3/envs/megatts3-env/lib/python3.9/site-packages/fastapi/_compat.py", line 286, in
ModelField(field_info=field_info, name=name)
File "", line 6, in __init__
File "/home/yunkai/miniconda3/envs/megatts3-env/lib/python3.9/site-packages/fastapi/_compat.py", line 111, in __post_init__
self._type_adapter: TypeAdapter[Any] = TypeAdapter(
File "/home/yunkai/miniconda3/envs/megatts3-env/lib/python3.9/site-packages/pydantic/type_adapter.py", line 227, in __init__
self._init_core_attrs(
File "/home/yunkai/miniconda3/envs/megatts3-env/lib/python3.9/site-packages/pydantic/type_adapter.py", line 289, in _init_core_attrs
core_schema = schema_generator.generate_schema(self._type)
File "/home/yunkai/miniconda3/envs/megatts3-env/lib/python3.9/site-packages/pydantic/_internal/_generate_schema.py", line 699, in generate_schema
schema = self._generate_schema_inner(obj)
File "/home/yunkai/miniconda3/envs/megatts3-env/lib/python3.9/site-packages/pydantic/_internal/_generate_schema.py", line 961, in _generate_schema_inner
return self._annotated_schema(obj)
File "/home/yunkai/miniconda3/envs/megatts3-env/lib/python3.9/site-packages/pydantic/_internal/_generate_schema.py", line 2211, in _annotated_schema
schema = self._apply_annotations(source_type, annotations)
File "/home/yunkai/miniconda3/envs/megatts3-env/lib/python3.9/site-packages/pydantic/_internal/_generate_schema.py", line 2257, in _apply_annotations
schema = get_inner_schema(source_type)
File "/home/yunkai/miniconda3/envs/megatts3-env/lib/python3.9/site-packages/pydantic/_internal/_schema_generation_shared.py", line 83, in __call__
schema = self._handler(source_type)
File "/home/yunkai/miniconda3/envs/megatts3-env/lib/python3.9/site-packages/pydantic/_internal/_generate_schema.py", line 2333, in new_handler
schema = get_inner_schema(source)
File "/home/yunkai/miniconda3/envs/megatts3-env/lib/python3.9/site-packages/pydantic/_internal/_schema_generation_shared.py", line 83, in __call__
schema = self._handler(source_type)
File "/home/yunkai/miniconda3/envs/megatts3-env/lib/python3.9/site-packages/pydantic/_internal/_generate_schema.py", line 2239, in inner_handler
schema = self._generate_schema_inner(obj)
File "/home/yunkai/miniconda3/envs/megatts3-env/lib/python3.9/site-packages/pydantic/_internal/_generate_schema.py", line 982, in _generate_schema_inner
return self.match_type(obj)
File "/home/yunkai/miniconda3/envs/megatts3-env/lib/python3.9/site-packages/pydantic/_internal/_generate_schema.py", line 1096, in match_type
return self._match_generic_type(obj, origin)
File "/home/yunkai/miniconda3/envs/megatts3-env/lib/python3.9/site-packages/pydantic/_internal/_generate_schema.py", line 1119, in _match_generic_type
return self._union_schema(obj)
File "/home/yunkai/miniconda3/envs/megatts3-env/lib/python3.9/site-packages/pydantic/_internal/_generate_schema.py", line 1407, in _union_schema
choices.append(self.generate_schema(arg))
File "/home/yunkai/miniconda3/envs/megatts3-env/lib/python3.9/site-packages/pydantic/_internal/_generate_schema.py", line 699, in generate_schema
schema = self._generate_schema_inner(obj)
File "/home/yunkai/miniconda3/envs/megatts3-env/lib/python3.9/site-packages/pydantic/_internal/_generate_schema.py", line 982, in _generate_schema_inner
return self.match_type(obj)
File "/home/yunkai/miniconda3/envs/megatts3-env/lib/python3.9/site-packages/pydantic/_internal/_generate_schema.py", line 1100, in match_type
return self._unknown_type_schema(obj)
File "/home/yunkai/miniconda3/envs/megatts3-env/lib/python3.9/site-packages/pydantic/_internal/_generate_schema.py", line 628, in _unknown_type_schema
raise PydanticSchemaGenerationError(
pydantic.errors.PydanticSchemaGenerationError: Unable to generate pydantic-core schema for . Set `arbitrary_types_allowed=True` in the model_config to ignore this error or implement `__get_pydantic_core_schema__` on your type to fully support it.

If you got this error by calling handler() within `__get_pydantic_core_schema__` then you likely need to call `handler.generate_schema()` since we do not call `__get_pydantic_core_schema__` on `` otherwise to avoid infinite recursion.

For further information visit https://errors.pydantic.dev/2.11/u/schema-for-unknown-type

Start by reproducing the traceback in the Gradio/FastAPI request path, then inspect the request_body_to_args and get_model_fields paths named in the stack trace. The issue does not define a requested change or acceptance test, so confirm the intended behavior and compatibility scope before assessing what would constitute a fix.

Written by the indexing model from the issue text.