jgoedeke commented on issue #59551:
URL: https://github.com/apache/airflow/issues/59551#issuecomment-3665357640
To make the DAG parse we set `default=None` in the Param:
````
'start_time': Param(
default=None,
title='Start time of the test',
type=['string', 'null'],
format='date-time',
),
````
But then when using the HITL action the following error occurs:
````
[2025-12-17 13:10:55] ERROR - Task failed with exception
HITLTriggerEventError: {'error': "Invalid input for param start_time:
{'value': None, 'schema': {'title': 'Start time of the test', 'type':
['string', 'null'], 'format': 'date-time'}} is not of type 'string',
'null'\n\nFailed validating 'type' in schema:\n {'title': 'Start time of the
test',\n 'type': ['string', 'null'],\n 'format': 'date-time'}\n\nOn
instance:\n {'value': None,\n 'schema': {'title': 'Start time of the
test',\n 'type': ['string', 'null'],\n 'format':
'date-time'}}", 'error_type': 'validation'}
File
"/home/airflow/.local/lib/python3.11/site-packages/airflow/sdk/execution_time/task_runner.py",
line 934 in run
File
"/home/airflow/.local/lib/python3.11/site-packages/airflow/sdk/execution_time/task_runner.py",
line 1325 in _execute_task
File
"/home/airflow/.local/lib/python3.11/site-packages/airflow/sdk/bases/operator.py",
line 1633 in resume_execution
File
"/home/airflow/.local/lib/python3.11/site-packages/airflow/providers/standard/operators/hitl.py",
line 184 in execute_complete
File
"/home/airflow/.local/lib/python3.11/site-packages/airflow/providers/standard/operators/hitl.py",
line 201 in process_trigger_event_error
````
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