Error executing task
java.util.concurrent.ExecutionException: java.lang.AssertionError: TRAP
at java.util.concurrent.FutureTask.report(Unknown Source) ~[?:1.8.0_111]

at java.util.concurrent.FutureTask.get(Unknown Source) ~[?:1.8.0_111]
at net.minecraft.server.v1_11_R1.SystemUtils.a(SourceFile:47) [server.ja
r:git-Spigot-7d78b81-f709362]
at net.minecraft.server.v1_11_R1.MinecraftServer.D(MinecraftServer.java:
739) [server.jar:git-Spigot-7d78b81-f709362]
at net.minecraft.server.v1_11_R1.DedicatedServer.D(DedicatedServer.java:
399) [server.jar:git-Spigot-7d78b81-f709362]
at net.minecraft.server.v1_11_R1.MinecraftServer.C(MinecraftServer.java:
675) [server.jar:git-Spigot-7d78b81-f709362]
at net.minecraft.server.v1_11_R1.MinecraftServer.run(MinecraftServer.jav
a:574) [server.jar:git-Spigot-7d78b81-f709362]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_111]
Caused by: java.lang.AssertionError: TRAP
at net.minecraft.server.v1_11_R1.ItemStack.F(ItemStack.java:94) ~[server
.jar:git-Spigot-7d78b81-f709362]
at net.minecraft.server.v1_11_R1.ItemStack.setCount(ItemStack.java:822)
~[server.jar:git-Spigot-7d78b81-f709362]
at net.minecraft.server.v1_11_R1.PlayerInteractManager.a(PlayerInteractM
anager.java:403) ~[server.jar:git-Spigot-7d78b81-f709362]
at net.minecraft.server.v1_11_R1.PlayerConnection.a(PlayerConnection.jav
a:957) ~[server.jar:git-Spigot-7d78b81-f709362]
at net.minecraft.server.v1_11_R1.PacketPlayInBlockPlace.a(PacketPlayInBl
ockPlace.java:26) ~[server.jar:git-Spigot-7d78b81-f709362]
at net.minecraft.server.v1_11_R1.PacketPlayInBlockPlace.a(PacketPlayInBl
ockPlace.java:1) ~[server.jar:git-Spigot-7d78b81-f709362]
at net.minecraft.server.v1_11_R1.PlayerConnectionUtils$1.run(SourceFile:
13) ~[server.jar:git-Spigot-7d78b81-f709362]
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) ~
[?:1.8.0_111]
at java.util.concurrent.FutureTask.run(Unknown Source) ~[?:1.8.0_111]
at net.minecraft.server.v1_11_R1.SystemUtils.a(SourceFile:46) ~[server.j
ar:git-Spigot-7d78b81-f709362]
... 5 more