[GitHub] [airflow] mik-laj commented on issue #14586: AttributeError: 'DatabaseBackend' object has no attribute 'task_cls'

[GitBox <gi...@apache.org>]

mik-laj commented on issue #14586:
URL: https://github.com/apache/airflow/issues/14586#issuecomment-791036601


   Can you provide the output of the commands below?
   ```
   python -c "from airflow.executors.celery_executor import app; print(type(app.backend))"
   <class 'celery.backends.database.DatabaseBackend'>
   ```
   ```
   pip freeze
   ```
   
   I suspect you are using an unsupported version of Celery. See: https://github.com/apache/airflow/issues/11301
   
   I recommend that you use constraints during installation. See: http://airflow.apache.org/docs/apache-airflow/stable/installation.html#constraints-files


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