No serialized dag found #58421
Description
Apache Airflow version
3.1.3
If "Other Airflow 2/3 version" selected, which one?
No response
What happened?
When I'm trying to start DAG (with a parameter provided via UI) manually, an error appears:
404 Not Found
The Dag with ID: `...` was not found
The api-server log:
wait-for-airflow-migrations
wait-for-airflow-migrations /home/airflow/.local/lib/python3.12/site-packages/airflow/providers/fab/auth_manager/fab_auth_manager.py:108 RemovedInAirflow4Warning: The airflow.security.permissions module is deprecated; please see https://airflow.apache.org/docs/apache-airflow/stable/security/deprecated_permissions.html
wait-for-airflow-migrations 2025-11-18T10:02:23.565520Z [info [] Context impl MySQLImpl. [alembic.runtime.migration] loc=migration.py:211
wait-for-airflow-migrations 2025-11-18T10:02:23.565758Z [info [] Will assume non-transactional DDL. [alembic.runtime.migration] loc=migration.py:214
api-server await app(scope, receive, sender)
api-server File "/home/airflow/.local/lib/python3.12/site-packages/starlette/routing.py", line 75, in app
api-server response = await f(request)
api-server ^^^^^^^^^^^^^^^^
api-server File "/home/airflow/.local/lib/python3.12/site-packages/fastapi/routing.py", line 308, in app
api-server raw_response = await run_endpoint_function(
api-server ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
api-server File "/home/airflow/.local/lib/python3.12/site-packages/fastapi/routing.py", line 221, in run_endpoint_function
api-server return await run_in_threadpool(dependant.call, **values)
api-server ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
api-server File "/home/airflow/.local/lib/python3.12/site-packages/starlette/concurrency.py", line 38, in run_in_threadpool
api-server return await anyio.to_thread.run_sync(func)
api-server ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
api-server File "/home/airflow/.local/lib/python3.12/site-packages/anyio/to_thread.py", line 56, in run_sync
api-server return await get_async_backend().run_sync_in_worker_thread(
api-server ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
api-server File "/home/airflow/.local/lib/python3.12/site-packages/anyio/_backends/_asyncio.py", line 2485, in run_sync_in_worker_thread
api-server return await future
api-server ^^^^^^^^^^^^
api-server File "/home/airflow/.local/lib/python3.12/site-packages/anyio/_backends/_asyncio.py", line 976, in run
api-server result = context.run(func, *args)
api-server ^^^^^^^^^^^^^^^^^^^^^^^^
api-server File "/home/airflow/.local/lib/python3.12/site-packages/airflow/api_fastapi/core_api/routes/ui/grid.py", line 417, in get_grid_ti_summaries
api-server task_instances = list(get_node_sumaries())
api-server ^^^^^^^^^^^^^^^^^^^^^^^^^
api-server File "/home/airflow/.local/lib/python3.12/site-packages/airflow/api_fastapi/core_api/routes/ui/grid.py", line 387, in get_node_sumaries
api-server node=serdag.dag.task_group,
api-server ^^^^^^^^^^
api-server AttributeError: 'NoneType' object has no attribute 'dag'
api-server 2025-11-18T10:07:47.267201Z [error [] No serialized dag found [airflow.api_fastapi.core_api.routes.ui.grid] dag_id=<...my dag id...> loc=grid.py:104 version_id=UUID('019a937a-0aae-7efd-b793-392930b44c56') version_number=8
api-server INFO: 172.24.148.170:40090 - "GET /ui/grid/ti_summaries/<...my dag id...>/manual__2025-11-18T10%3A05%3A56%2B00%3A00 HTTP/1.1" 500 Internal Server Error
api-server ERROR: Exception in ASGI application
api-server Traceback (most recent call last):
api-server File "/home/airflow/.local/lib/python3.12/site-packages/uvicorn/protocols/http/httptools_impl.py", line 409, in run_asgi
api-server result = await app( # type: ignore[func-returns-value]
api-server ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
api-server File "/home/airflow/.local/lib/python3.12/site-packages/fastapi/applications.py", line 1082, in __call__
api-server await super().__call__(scope, receive, send)
api-server File "/home/airflow/.local/lib/python3.12/site-packages/starlette/applications.py", line 113, in __call__
api-server await self.middleware_stack(scope, receive, send)
api-server File "/home/airflow/.local/lib/python3.12/site-packages/starlette/middleware/errors.py", line 186, in __call__
api-server raise exc
api-server File "/home/airflow/.local/lib/python3.12/site-packages/starlette/middleware/errors.py", line 164, in __call__
api-server await self.app(scope, receive, _send)
api-server File "/home/airflow/.local/lib/python3.12/site-packages/starlette/middleware/gzip.py", line 29, in __call__
api-server await responder(scope, receive, send)
api-server File "/home/airflow/.local/lib/python3.12/site-packages/starlette/middleware/gzip.py", line 130, in __call__
api-server await super().__call__(scope, receive, send)
api-server File "/home/airflow/.local/lib/python3.12/site-packages/starlette/middleware/gzip.py", line 46, in __call__
api-server await self.app(scope, receive, self.send_with_compression)
api-server File "/home/airflow/.local/lib/python3.12/site-packages/starlette/middleware/cors.py", line 85, in __call__
api-server await self.app(scope, receive, send)
api-server File "/home/airflow/.local/lib/python3.12/site-packages/starlette/middleware/exceptions.py", line 63, in __call__
api-server await wrap_app_handling_exceptions(self.app, conn)(scope, receive, send)
api-server File "/home/airflow/.local/lib/python3.12/site-packages/starlette/_exception_handler.py", line 53, in wrapped_app
api-server raise exc
api-server File "/home/airflow/.local/lib/python3.12/site-packages/starlette/_exception_handler.py", line 42, in wrapped_app
api-server await app(scope, receive, sender)
api-server File "/home/airflow/.local/lib/python3.12/site-packages/starlette/routing.py", line 716, in __call__
api-server await self.middleware_stack(scope, receive, send)
api-server File "/home/airflow/.local/lib/python3.12/site-packages/starlette/routing.py", line 736, in app
api-server await route.handle(scope, receive, send)
api-server File "/home/airflow/.local/lib/python3.12/site-packages/starlette/routing.py", line 290, in handle
api-server await self.app(scope, receive, send)
api-server File "/home/airflow/.local/lib/python3.12/site-packages/starlette/routing.py", line 78, in app
api-server await wrap_app_handling_exceptions(app, request)(scope, receive, send)
api-server File "/home/airflow/.local/lib/python3.12/site-packages/starlette/_exception_handler.py", line 53, in wrapped_app
api-server raise exc
api-server File "/home/airflow/.local/lib/python3.12/site-packages/starlette/_exception_handler.py", line 42, in wrapped_app
api-server await app(scope, receive, sender)
api-server File "/home/airflow/.local/lib/python3.12/site-packages/starlette/routing.py", line 75, in app
api-server response = await f(request)
api-server ^^^^^^^^^^^^^^^^
api-server File "/home/airflow/.local/lib/python3.12/site-packages/fastapi/routing.py", line 308, in app
api-server raw_response = await run_endpoint_function(
api-server ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
api-server File "/home/airflow/.local/lib/python3.12/site-packages/fastapi/routing.py", line 221, in run_endpoint_function
api-server return await run_in_threadpool(dependant.call, **values)
api-server ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
api-server File "/home/airflow/.local/lib/python3.12/site-packages/starlette/concurrency.py", line 38, in run_in_threadpool
api-server return await anyio.to_thread.run_sync(func)
api-server ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
api-server File "/home/airflow/.local/lib/python3.12/site-packages/anyio/to_thread.py", line 56, in run_sync
api-server return await get_async_backend().run_sync_in_worker_thread(
api-server ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
api-server File "/home/airflow/.local/lib/python3.12/site-packages/anyio/_backends/_asyncio.py", line 2485, in run_sync_in_worker_thread
api-server return await future
api-server ^^^^^^^^^^^^
api-server File "/home/airflow/.local/lib/python3.12/site-packages/anyio/_backends/_asyncio.py", line 976, in run
api-server result = context.run(func, *args)
api-server ^^^^^^^^^^^^^^^^^^^^^^^^
api-server File "/home/airflow/.local/lib/python3.12/site-packages/airflow/api_fastapi/core_api/routes/ui/grid.py", line 417, in get_grid_ti_summaries
api-server task_instances = list(get_node_sumaries())
api-server ^^^^^^^^^^^^^^^^^^^^^^^^^
api-server File "/home/airflow/.local/lib/python3.12/site-packages/airflow/api_fastapi/core_api/routes/ui/grid.py", line 387, in get_node_sumaries
api-server node=serdag.dag.task_group,
api-server ^^^^^^^^^^
api-server AttributeError: 'NoneType' object has no attribute 'dag'
api-server INFO: 172.24.160.138:49844 - "GET /api/v2/version HTTP/1.1" 200 OK
api-server INFO: 172.24.160.138:49846 - "GET /api/v2/version HTTP/1.1" 200 OK
What you think should happen instead?
No response
How to reproduce
This error appeared after updating from 3.1.0 to 3.1.3.
After reverting back to the 3.1.0 - the error disappeared without any changes in the DAGs code.
Operating System
linux amd64
Versions of Apache Airflow Providers
No response
Deployment
Official Apache Airflow Helm Chart
Deployment details
official chart 1.18.0 deployed to AWS EKS.
Anything else?
No response
Are you willing to submit PR?
- Yes I am willing to submit a PR!
Code of Conduct
- I agree to follow this project's Code of Conduct