Your Tropic world generator appears to be a tad broken :(. Please fix the ram usage, or whatever it is that's making it crash my server. http://forums.bukkit.org/threads/wgen-tropic-v0-0-2-add-tropic-landscapes-to-your-server-1-2-4-r1-0.64731/
I have an error ---> http://pastie.org/3167428 Please help! I have Essentials, Pail, Groupmanager, Vault, and more... THANK YOU