I've done a lot of maps with custom programs like WEU oder NewGen, and I noticed this info message too, mostly it comes if you load a map or start the Editor itself..
But as far as i noticed, this doesn't effect anything, everything is still working, without any disadvantages.. so it could probably just bad luck, that roar doesn't work any more, or it's because of something different.. but as far as I know, this error messages doesn't change anything.