menthamin commented on issue #18186:
URL: https://github.com/apache/airflow/issues/18186#issuecomment-917609944
I solved the problem by reinstalling airflow-related packages with the
following command.
```
pip install apache-airflow
```
It seems to be a SQLAlchemy dependency problem
```
Requirement already satisfied: apache-airflow in
./airflow/lib/python3.8/site-packages (2.1.3)
Requirement already satisfied: gunicorn>=19.5.0 in
./airflow/lib/python3.8/site-packages (from apache-airflow) (20.1.0)
...
Installing collected packages: sqlalchemy
Attempting uninstall: sqlalchemy
Found existing installation: SQLAlchemy 1.3.2
Uninstalling SQLAlchemy-1.3.2:
Successfully uninstalled SQLAlchemy-1.3.2
Successfully installed sqlalchemy-1.3.24
```
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