[11:38:16] [Server thread/FATAL]: Error executing task
java.util.concurrent.ExecutionException: java.util.NoSuchElementException
	at java.util.concurrent.FutureTask.report(FutureTask.java:122) ~[?:1.8.0_74]
	at java.util.concurrent.FutureTask.get(FutureTask.java:192) ~[?:1.8.0_74]
	at net.minecraft.server.v1_9_R1.SystemUtils.a(SourceFile:46) [patched_1.9.jar:git-Paper-475]
	at net.minecraft.server.v1_9_R1.MinecraftServer.D(MinecraftServer.java:775) [patched_1.9.jar:git-Paper-475]
	at net.minecraft.server.v1_9_R1.DedicatedServer.D(DedicatedServer.java:404) [patched_1.9.jar:git-Paper-475]
	at net.minecraft.server.v1_9_R1.MinecraftServer.C(MinecraftServer.java:714) [patched_1.9.jar:git-Paper-475]
	at net.minecraft.server.v1_9_R1.MinecraftServer.run(MinecraftServer.java:613) [patched_1.9.jar:git-Paper-475]
	at java.lang.Thread.run(Thread.java:745) [?:1.8.0_74]
Caused by: java.util.NoSuchElementException
	at java.util.LinkedHashMap$LinkedHashIterator.nextNode(LinkedHashMap.java:713) ~[?:1.8.0_74]
	at java.util.LinkedHashMap$LinkedKeyIterator.next(LinkedHashMap.java:734) ~[?:1.8.0_74]
	at net.drgnome.virtualpack.components.VAnvil.e(VAnvil.java:172) ~[?:?]
	at net.minecraft.server.v1_9_R1.ContainerAnvil.a(ContainerAnvil.java:109) ~[patched_1.9.jar:git-Paper-475]
	at net.drgnome.virtualpack.components.VAnvil.a(VAnvil.java:38) ~[?:?]
	at net.minecraft.server.v1_9_R1.ContainerAnvil$1.update(ContainerAnvil.java:22) ~[patched_1.9.jar:git-Paper-475]
	at net.minecraft.server.v1_9_R1.InventorySubcontainer.setItem(InventorySubcontainer.java:145) ~[patched_1.9.jar:git-Paper-475]
	at net.minecraft.server.v1_9_R1.Slot.set(Slot.java:55) ~[patched_1.9.jar:git-Paper-475]
	at net.minecraft.server.v1_9_R1.Container.a(Container.java:556) ~[patched_1.9.jar:git-Paper-475]
	at net.drgnome.virtualpack.components.VAnvil.b(VAnvil.java:307) ~[?:?]
	at net.minecraft.server.v1_9_R1.Container.a(Container.java:259) ~[patched_1.9.jar:git-Paper-475]
	at net.drgnome.virtualpack.components.VAnvil.a(VAnvil.java:47) ~[?:?]
	at net.minecraft.server.v1_9_R1.PlayerConnection.a(PlayerConnection.java:1880) ~[patched_1.9.jar:git-Paper-475]
	at net.minecraft.server.v1_9_R1.PacketPlayInWindowClick.a(SourceFile:33) ~[patched_1.9.jar:git-Paper-475]
	at net.minecraft.server.v1_9_R1.PacketPlayInWindowClick.a(SourceFile:10) ~[patched_1.9.jar:git-Paper-475]
	at net.minecraft.server.v1_9_R1.PlayerConnectionUtils$1.run(SourceFile:13) ~[patched_1.9.jar:git-Paper-475]
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_74]
	at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_74]
	at net.minecraft.server.v1_9_R1.SystemUtils.a(SourceFile:45) ~[patched_1.9.jar:git-Paper-475]
	... 5 more