I’m replying over here to keep everything in one place. I have not noticed this error, but it is very possible this is due to some work I have done to get this trigger working again. This OsgiEventTrigger and DirectoryTrigger have not worked in a long while. I’m surprised that nobody else has reported it!
Did you already have the helper libraries installed? If so, have you downloaded a recent version of the core scripts?
The error will not harm anything, but you won’t be able to use this trigger, which doesn’t work anyhow. So, safe to ignore it and I’ll get it fixed.