java.util.concurrent.ExecutionException: java.lang.AssertionError


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java.lang.AssertionError: java.lang.AssertionError: null

Stack trace

java.util.concurrent.ExecutionException: java.lang.AssertionError
	at java.util.concurrent.FutureTask.report(FutureTask.java:122)[?:1.8.0_111]
	at java.util.concurrent.FutureTask.get(FutureTask.java:192)[?:1.8.0_111]
	at net.minecraft.util.Util.runTask(Util.java:26)[Util.class:?]
	at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:742)[MinecraftServer.class:?]
	at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:687)[MinecraftServer.class:?]
	at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:156)[IntegratedServer.class:?]
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:536)[MinecraftServer.class:?]
	at java.lang.Thread.run(Thread.java:745)[?:1.8.0_111]
Caused by: java.lang.AssertionError
	at io.netty.channel.embedded.EmbeddedChannel.writeOutbound(EmbeddedChannel.java:203)[EmbeddedChannel.class:4.0.23.Final]
	at net.minecraftforge.fml.common.network.internal.FMLNetworkHandler.openGui(FMLNetworkHandler.java:97)[FMLNetworkHandler.class:?]
	at net.minecraft.entity.player.EntityPlayer.openGui(EntityPlayer.java:2723)[EntityPlayer.class:?]
	at de.teamlapen.vampirism.blocks.BlockHunterTable.onBlockActivated(BlockHunterTable.java:65)[BlockHunterTable.class:?]
	at net.minecraft.server.management.PlayerInteractionManager.processRightClickBlock(PlayerInteractionManager.java:477)[PlayerInteractionManager.class:?]
	at net.minecraft.network.NetHandlerPlayServer.processRightClickBlock(NetHandlerPlayServer.java:706)[NetHandlerPlayServer.class:?]
	at net.minecraft.network.play.client.CPacketPlayerTryUseItemOnBlock.processPacket(CPacketPlayerTryUseItemOnBlock.java:68)[CPacketPlayerTryUseItemOnBlock.class:?]
	at net.minecraft.network.play.client.CPacketPlayerTryUseItemOnBlock.processPacket(CPacketPlayerTryUseItemOnBlock.java:13)[CPacketPlayerTryUseItemOnBlock.class:?]
	at net.minecraft.network.PacketThreadUtil$1.run(PacketThreadUtil.java:15)[PacketThreadUtil$1.class:?]
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)[?:1.8.0_111]
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)[?:1.8.0_111]
	at net.minecraft.util.Util.runTask(Util.java:25)[Util.class:?]
	... 5 more

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