DAG Not Appearing Due to Parse Errors
criticalreliabilityUpdated Jan 24, 2026
DAGs fail to appear in UI because Python syntax errors, import failures, or missing DAG object prevent successful parsing, blocking all task execution for that DAG.
Sources
Technologies:
How to detect:
Run 'airflow dags list-import-errors' regularly or monitor import_errors metric. Check that DAG files in dags_folder parse without exceptions and instantiate a DAG object at module level.
Recommended action:
Fix syntax errors in DAG files; ensure all required imports are available in the Airflow environment; verify DAG object is assigned at module level (not inside a function); test DAG files with 'python /path/to/dag.py' before deployment.