When using a virtualenv and if you only want to up grade deals added for your virtualenv, you might want to do: all classes and interfaces during the superclass hierarchy (e.g. see Java course is current in classpath but startup fails with Error: Could not discover or load main course) https://proud-pira-group70245.bloggadores.com/33012061/uninterruptible-power-supply-cyberpower-an-overview