[17:45:55] [pool-3-thread-12/WARN]: Couldn't look up profile properties for net.minecraft.util.com.mojang.authlib.GameProfile@4244e1f1[id=f84c6a79-0a4e-45e0-879b-cd49ebd4c4e2,name=,properties={},legacy=false]
net.minecraft.util.com.mojang.authlib.exceptions.AuthenticationException: The client has sent too many requests within a certain amount of time
	at net.minecraft.util.com.mojang.authlib.yggdrasil.YggdrasilAuthenticationService.makeRequest(YggdrasilAuthenticationService.java:65) ~[craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
	at net.minecraft.util.com.mojang.authlib.yggdrasil.YggdrasilMinecraftSessionService.fillProfileProperties(YggdrasilMinecraftSessionService.java:135) [craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
	at net.citizensnpcs.npc.entity.HumanController$SkinFetcher.run(HumanController.java:117) [Citizens.jar:?]
	at org.bukkit.craftbukkit.v1_7_R3.scheduler.CraftTask.run(CraftTask.java:53) [craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
	at org.bukkit.craftbukkit.v1_7_R3.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:53) [craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) [?:1.7.0_67]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) [?:1.7.0_67]
	at java.lang.Thread.run(Unknown Source) [?:1.7.0_67]
[17:47:05] [Server thread/INFO]: Couldn't retrieve your world. Default world 'world' selected.