sorry, no bug, but something similar:
Pls also check while creating the xml file, if the route,eventlistener,... files exist.
We forgot several times to delete the "association" in the acp, when we deleted a route/event listener file. (if it something what's not called very often, it's impossible to track the error. It's only visible if somebody tries to install the add-on an
I've fixed this. I've also added some checks related to installing and uninstalling that ensure that the necessary code is available before they can be run (should give nicer errors if they were to happen).