2015-05-30 02:08:33 [FATAL] Error executing task
java.util.concurrent.ExecutionException: java.lang.NullPointerException
        at java.util.concurrent.FutureTask.report(FutureTask.java:122) ~[?:1.8.0_45-internal]
        at java.util.concurrent.FutureTask.get(FutureTask.java:192) ~[?:1.8.0_45-internal]
        at net.minecraft.server.v1_8_R2.SystemUtils.a(SourceFile:61) [spigot.jar:git-Spigot-1d14d5f-7722428]
        at net.minecraft.server.v1_8_R2.MinecraftServer.A(MinecraftServer.java:710) [spigot.jar:git-Spigot-1d14d5f-7722428]
        at net.minecraft.server.v1_8_R2.DedicatedServer.A(DedicatedServer.java:368) [spigot.jar:git-Spigot-1d14d5f-7722428]
        at net.minecraft.server.v1_8_R2.MinecraftServer.z(MinecraftServer.java:651) [spigot.jar:git-Spigot-1d14d5f-7722428]
        at net.minecraft.server.v1_8_R2.MinecraftServer.run(MinecraftServer.java:554) [spigot.jar:git-Spigot-1d14d5f-7722428]
        at java.lang.Thread.run(Thread.java:745) [?:1.8.0_45-internal]
Caused by: java.lang.NullPointerException
        at net.minecraft.server.v1_8_R2.ShapedRecipes.a(ShapedRecipes.java:150) ~[spigot.jar:git-Spigot-1d14d5f-7722428]
        at net.minecraft.server.v1_8_R2.CraftingManager.craft(CraftingManager.java:297) ~[spigot.jar:git-Spigot-1d14d5f-7722428]
        at net.minecraft.server.v1_8_R2.ContainerWorkbench.a(ContainerWorkbench.java:56) ~[spigot.jar:git-Spigot-1d14d5f-7722428]
        at net.minecraft.server.v1_8_R2.InventoryCrafting.splitStack(InventoryCrafting.java:119) ~[spigot.jar:git-Spigot-1d14d5f-7722428]
        at net.minecraft.server.v1_8_R2.Slot.a(Slot.java:72) ~[spigot.jar:git-Spigot-1d14d5f-7722428]
        at net.minecraft.server.v1_8_R2.Container.clickItem(Container.java:299) ~[spigot.jar:git-Spigot-1d14d5f-7722428]
        at net.minecraft.server.v1_8_R2.PlayerConnection.a(PlayerConnection.java:1625) ~[spigot.jar:git-Spigot-1d14d5f-7722428]
        at net.minecraft.server.v1_8_R2.PacketPlayInWindowClick.a(SourceFile:31) ~[spigot.jar:git-Spigot-1d14d5f-7722428]
        at net.minecraft.server.v1_8_R2.PacketPlayInWindowClick.a(SourceFile:9) ~[spigot.jar:git-Spigot-1d14d5f-7722428]
        at net.minecraft.server.v1_8_R2.PlayerConnectionUtils$1.run(SourceFile:13) ~[spigot.jar:git-Spigot-1d14d5f-7722428]
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_45-internal]
        at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_45-internal]
        at net.minecraft.server.v1_8_R2.SystemUtils.a(SourceFile:60) ~[spigot.jar:git-Spigot-1d14d5f-7722428]
        ... 5 more