jpipas commented on issue #23588:
URL: https://github.com/apache/airflow/issues/23588#issuecomment-1131908779

   The web server error is what I posted above... ends with:
   
   `AttributeError: 'dict' object has no attribute 'dump'`
   
   I too am getting the same JS errors that @rotemseekingalpha is showing as 
well.  My theory about taskgroups however, appears wrong because it's also 
happening on "non-taskgroup" DAGs.  In my case they're "previously parsed" 
dags, and were there before the upgrade to 2.3.0 - so I assume there's 
something in the migration for these dags or that happened to them in the past 
that 2.3.0 just doesn't like.


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