zorzigio commented on issue #21459:
URL: https://github.com/apache/airflow/issues/21459#issuecomment-1034163857
Not sure if this is related, but I am also seeing an "Import error" every
now and then, apparently appearing out of thin air
```bash
Broken DAG: [/opt/airflow/dags/repo/dags/documents/DEV/file_pipeline.py]
Traceback (most recent call last):
File
"/home/airflow/.local/lib/python3.9/site-packages/airflow/serialization/serialized_objects.py",
line 574, in serialize_operator
serialize_op['params'] = cls._serialize_params_dict(op.params)
File
"/home/airflow/.local/lib/python3.9/site-packages/airflow/serialization/serialized_objects.py",
line 447, in _serialize_params_dict
if f'{v.__module__}.{v.__class__.__name__}' ==
'airflow.models.param.Param':
AttributeError: 'str' object has no attribute '__module__'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File
"/home/airflow/.local/lib/python3.9/site-packages/airflow/serialization/serialized_objects.py",
line 935, in to_dict
json_dict = {"__version": cls.SERIALIZER_VERSION, "dag":
cls.serialize_dag(var)}
File
"/home/airflow/.local/lib/python3.9/site-packages/airflow/serialization/serialized_objects.py",
line 847, in serialize_dag
raise SerializationError(f'Failed to serialize DAG {dag.dag_id!r}: {e}')
airflow.exceptions.SerializationError: Failed to serialize DAG
'DEV_file_pipeline': 'str' object has no attribute '__module__'
```
This disappears when I refresh the page
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