Newest CraftBukkit-DevBuild + latest VanishNoPacket-JenkinsBuild:

[Server thread/WARN]: [VanishNoPacket] "VanishNoPacket v3.18.7-74314ba" has registered a listener for org.kitteh.tag.PlayerReceiveNameTagEvent on method "public void org.kitteh.vanish.listeners.TagAPIListener.onNameTag(org.kitteh.tag.PlayerReceiveNameTagEvent)", but the event is Deprecated. "Server performance will be affected"; please notify the authors [mbaxter].

Error ouccurrs at serverstartup in log

You've acquired a dev build of TagAPI. TagAPI dev builds are not guaranteed to be stable and contain code that has not gone live yet.

I'll update VNP when I release the TagAPI update :)