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Administrator
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`FitTrackee fails to start`
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- Check the database URL in `environment variables <../installation.html#envvar-DATABASE_URL>`__ if the following error is displayed in **gunicorn** logs:
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.. code::
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sqlalchemy.exc.NoSuchModuleError: Can't load plugin: sqlalchemy.dialects:postgres
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It must start with `postgresql://` (engine URLs starting with `postgres://` are no longer supported).
- Check the email URL in `environment variables <../installation.html#envvar-EMAIL_URL>`__ if the following error is displayed in **gunicorn** logs:
.. code::
fittrackee.emails.exceptions.InvalidEmailUrlScheme
A valid ``EMAIL_URL`` must be provided (see `emails <../installation.html#emails>`__).
