I'm getting an error when executing the cleanup scripts in Galaxy 16.01. It appears the script is unable to import sqlalchemy, but my understanding is that Galaxy can't function without it, so I'm at a loss to explain. Here's the error I'm getting:

$ sh scripts/cleanup_datasets/delete_userless_histories.sh

Traceback (most recent call last):

  File "./scripts/cleanup_datasets/cleanup_datasets.py", line 13, in <module>

    import sqlalchemy as sa

ImportError: No module named sqlalchemy

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