java.util.concurrent.ExecutionException: java.lang.AbstractMethodError
	at java.util.concurrent.FutureTask.report(FutureTask.java:122) ~[?:1.8.0_25]
	at java.util.concurrent.FutureTask.get(FutureTask.java:192) ~[?:1.8.0_25]
	at net.minecraft.util.Util.func_181617_a(SourceFile:46) [h.class:?]
	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:666) [MinecraftServer.class:?]
	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:611) [MinecraftServer.class:?]
	at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:148) [byl.class:?]
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:469) [MinecraftServer.class:?]
	at java.lang.Thread.run(Thread.java:745) [?:1.8.0_25]
Caused by: java.lang.AbstractMethodError
	at net.minecraft.inventory.Slot.func_75211_c(Slot.java:62) ~[abt.class:?]
	at net.minecraft.inventory.Container.func_75138_a(Container.java:58) ~[aau.class:?]
	at net.minecraft.inventory.Container.func_75132_a(Container.java:47) ~[aau.class:?]
	at net.minecraftforge.fml.common.network.internal.FMLNetworkHandler.openGui(FMLNetworkHandler.java:93) ~[FMLNetworkHandler.class:?]
	at net.minecraft.entity.player.EntityPlayer.openGui(EntityPlayer.java:2473) ~[zj.class:?]
	at io.github.elytra.engination.block.BlockGenerator.func_180639_a(BlockGenerator.java:71) ~[BlockGenerator.class:?]
	at net.minecraft.server.management.PlayerInteractionManager.func_187251_a(PlayerInteractionManager.java:449) ~[lt.class:?]
	at net.minecraft.network.NetHandlerPlayServer.func_184337_a(NetHandlerPlayServer.java:680) ~[mc.class:?]
	at net.minecraft.network.play.client.CPacketPlayerTryUseItemOnBlock.func_148833_a(SourceFile:55) ~[jh.class:?]
	at net.minecraft.network.play.client.CPacketPlayerTryUseItemOnBlock.func_148833_a(SourceFile:11) ~[jh.class:?]
	at net.minecraft.network.PacketThreadUtil$1.run(SourceFile:13) ~[fj$1.class:?]
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_25]
	at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_25]
	at net.minecraft.util.Util.func_181617_a(SourceFile:45) ~[h.class:?]
	... 5 more
[05:59:29] [Server thread/ERROR]: Encountered an unexpected exception
net.minecraft.util.ReportedException: Ticking player
	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:713) ~[MinecraftServer.class:?]
	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:611) ~[MinecraftServer.class:?]
	at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:148) ~[byl.class:?]
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:469) [MinecraftServer.class:?]
	at java.lang.Thread.run(Thread.java:745) [?:1.8.0_25]
Caused by: java.lang.AbstractMethodError
	at net.minecraft.inventory.Slot.func_75211_c(Slot.java:62) ~[abt.class:?]
	at net.minecraft.inventory.Container.func_75142_b(Container.java:74) ~[aau.class:?]
	at net.minecraft.entity.player.EntityPlayerMP.func_70071_h_(EntityPlayerMP.java:254) ~[ls.class:?]
	at net.minecraft.world.World.func_72866_a(World.java:1951) ~[aht.class:?]
	at net.minecraft.world.WorldServer.func_72866_a(WorldServer.java:837) ~[lq.class:?]
	at net.minecraft.world.World.func_72870_g(World.java:1920) ~[aht.class:?]
	at net.minecraft.world.WorldServer.func_184147_l(WorldServer.java:647) ~[lq.class:?]
	at net.minecraft.world.World.func_72939_s(World.java:1719) ~[aht.class:?]
	at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:618) ~[lq.class:?]
	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:707) ~[MinecraftServer.class:?]
	... 4 more