No module named ....
Example: "ImportError: No module named BeautifulSoup"
This error occurs when a plugin tries to load a module that doesn't exist or isn't in a path that Supybot knows about.
If this is happening after an upgrade from pre-0.83.0 to 0.83.0 or higher, the problem is most likely that you forgot to uninstall the previous version first.
Also worth noting is that loading plugins is case-sensitive. load debian is not the same as load Debian. The latter is correct, and the former is not.
This Error Reference applies to: Any version.