[21:56:11 FATAL]: Error executing task
 java.util.concurrent.ExecutionException: java.lang.IndexOutOfBoundsException: Index: 66, Size: 63
        at java.util.concurrent.FutureTask.report(FutureTask.java:122) ~[?:1.8.0_282]
        at java.util.concurrent.FutureTask.get(FutureTask.java:192) ~[?:1.8.0_282]
        at net.minecraft.util.Util.func_181617_a(SourceFile:47) [h.class:?]
        at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:840) [MinecraftServer.class:?]
        at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:461) [nz.class:?]
        at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:778) [MinecraftServer.class:?]
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:624) [MinecraftServer.class:?]
        at java.lang.Thread.run(Thread.java:748) [?:1.8.0_282]
Caused by: java.lang.IndexOutOfBoundsException: Index: 66, Size: 63
        at java.util.ArrayList.rangeCheck(ArrayList.java:659) ~[?:1.8.0_282]
        at java.util.ArrayList.get(ArrayList.java:435) ~[?:1.8.0_282]
        at net.minecraft.inventory.Container.func_75139_a(Container.java:219) ~[afr.class:?]
        at net.minecraft.network.NetHandlerPlayServer.func_147351_a(NetHandlerPlayServer.java:1942) ~[pa.class:?]
        at net.minecraft.network.play.client.CPacketClickWindow.func_148833_a(CPacketClickWindow.java:38) ~[lf.class:?]
        at net.minecraft.network.play.client.CPacketClickWindow.func_148833_a(CPacketClickWindow.java:12) ~[lf.class:?]
        at net.minecraft.network.PacketThreadUtil.lambda$checkThreadAndEnqueue$0(PacketThreadUtil.java:16) ~[hv.class:?]
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_282]
        at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_282]
        at net.minecraft.util.Util.func_181617_a(SourceFile:46) ~[h.class:?]
        ... 5 more