Well I suggest you try it somewhere else first to see if it works then try it there again, the only thing wrong I can think of would be navmesh. If there is no Navmesh where your trying to spawn your dragon then it won't work.
Glad it worked out. No need to apologise, asking for help is the point of this forum. Also, sorry about the actorbase/actor error earlier, I'm using my phone while I'm at work, too much text for such a small display