Error

[17:02:48] [User Authenticator #3/INFO]: UUID of player 0ce is 9ae4c2eb-7540-45d7-b941-9c0f98afcb80
[17:02:48] [Server thread/INFO]: 0ce[/127.0.0.1:64181] logged in with entity id 2928 at ([world] -179.3802747886599, 79.0, 295.8680638669668)
[17:02:51] [Server thread/WARN]: [Wait] Task #49 for Wait v1.0 generated an exception
java.lang.NullPointerException
	at me.themineshack.Wait$1.run(Wait.java:30) ~[?:?]
	at org.bukkit.craftbukkit.v1_8_R1.scheduler.CraftTask.run(CraftTask.java:71) ~[spigotw18.jar:git-Spigot-d5bf866-b73cfb0]
	at org.bukkit.craftbukkit.v1_8_R1.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:350) [spigotw18.jar:git-Spigot-d5bf866-b73cfb0]
	at net.minecraft.server.v1_8_R1.MinecraftServer.z(MinecraftServer.java:694) [spigotw18.jar:git-Spigot-d5bf866-b73cfb0]
	at net.minecraft.server.v1_8_R1.DedicatedServer.z(DedicatedServer.java:316) [spigotw18.jar:git-Spigot-d5bf866-b73cfb0]
	at net.minecraft.server.v1_8_R1.MinecraftServer.y(MinecraftServer.java:623) [spigotw18.jar:git-Spigot-d5bf866-b73cfb0]
	at net.minecraft.server.v1_8_R1.MinecraftServer.run(MinecraftServer.java:526) [spigotw18.jar:git-Spigot-d5bf866-b73cfb0]
	at java.lang.Thread.run(Unknown Source) [?:1.8.0_31]