I resolved the issue. In sqlalchemy, they renamed a file from exceptions.py to exc.py. The solution was to create a symlink in the directory /usr/lib/python2.7/site-packages/sqlalchemy/ from exc.py to exceptions.py.
I resolved the issue. In sqlalchemy, they renamed a file from exceptions.py to exc.py. The solution was to create a symlink in the directory /usr/lib/ python2. 7/site- packages/ sqlalchemy/ from exc.py to exceptions.py.