Or do you want to shoot the Messenger? OSGi tends to complain about things that seem to work everywhere else. If you are interested in why this is the case, this is the session you want to attend.
OSGi warns you quite early if you put things in it that will become ugly. It is its way to shine light in the dark corners wehere Murphy can lurk. Often the reasons are not with your code, but you get pushed there by bad libraries and insufficient tooling. Come along on a wonderous tour on the most common things you may run into and find out why they appear and how to solve them.