[19:37:23] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 5447ms behind, skipping 108 tick(s)
[19:37:48] [Server thread/FATAL]: Error executing task
java.util.concurrent.ExecutionException: java.lang.NoClassDefFoundError: net/minecraft/world/World$2
	at java.util.concurrent.FutureTask.report(Unknown Source) ~[?:1.8.0_144]
	at java.util.concurrent.FutureTask.get(Unknown Source) ~[?:1.8.0_144]
	at net.minecraft.util.Util.func_181617_a(SourceFile:47) [h.class:?]
	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:679) [MinecraftServer.class:?]
	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:624) [MinecraftServer.class:?]
	at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:240) [cch.class:?]
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:482) [MinecraftServer.class:?]
	at java.lang.Thread.run(Unknown Source) [?:1.8.0_144]
Caused by: java.lang.NoClassDefFoundError: net/minecraft/world/World$2
	at net.minecraft.world.World.func_190524_a(World.java:549) ~[ajs.class:?]
	at net.minecraft.world.World.func_175685_c(World.java:487) ~[ajs.class:?]
	at net.minecraft.block.BlockRedstoneWire.func_176344_d(BlockRedstoneWire.java:249) ~[aqb.class:?]
	at net.minecraft.block.BlockRedstoneWire.func_180663_b(BlockRedstoneWire.java:301) ~[aqb.class:?]
	at buildcraft.builders.snapshot.FakeWorld.breakBlockAndGetDrops(FakeWorld.java:160) ~[FakeWorld.class:?]
	at buildcraft.builders.snapshot.SchematicBlockDefault.computeRequiredItems(SchematicBlockDefault.java:237) ~[SchematicBlockDefault.class:?]
	at buildcraft.builders.snapshot.SchematicBlockManager.computeRequired(SchematicBlockManager.java:92) ~[SchematicBlockManager.class:?]
	at buildcraft.builders.snapshot.Blueprint$BuildingInfo.<init>(Blueprint.java:145) ~[Blueprint$BuildingInfo.class:?]
	at buildcraft.builders.tile.TileBuilder.updateSnapshot(TileBuilder.java:167) ~[TileBuilder.class:?]
	at buildcraft.builders.tile.TileBuilder.onSlotChange(TileBuilder.java:135) ~[TileBuilder.class:?]
	at buildcraft.lib.tile.item.ItemHandlerSimple.setStackInternal(ItemHandlerSimple.java:230) ~[ItemHandlerSimple.class:?]
	at buildcraft.lib.tile.item.ItemHandlerSimple.setStackInSlot(ItemHandlerSimple.java:194) ~[ItemHandlerSimple.class:?]
	at net.minecraftforge.items.SlotItemHandler.func_75215_d(SlotItemHandler.java:80) ~[SlotItemHandler.class:?]
	at net.minecraft.inventory.Container.func_184996_a(Container.java:281) ~[acl.class:?]
	at buildcraft.lib.gui.ContainerBC_Neptune.func_184996_a(ContainerBC_Neptune.java:114) ~[ContainerBC_Neptune.class:?]
	at net.minecraft.network.NetHandlerPlayServer.func_147351_a(NetHandlerPlayServer.java:1106) ~[mi.class:?]
	at net.minecraft.network.play.client.CPacketClickWindow.func_148833_a(SourceFile:33) ~[iu.class:?]
	at net.minecraft.network.play.client.CPacketClickWindow.func_148833_a(SourceFile:10) ~[iu.class:?]
	at net.minecraft.network.PacketThreadUtil$1.run(SourceFile:13) ~[fo$1.class:?]
	at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) ~[?:1.8.0_144]
	at java.util.concurrent.FutureTask.run(Unknown Source) ~[?:1.8.0_144]
	at net.minecraft.util.Util.func_181617_a(SourceFile:46) ~[h.class:?]
	... 5 more
[19:37:48] [Server thread/INFO]: Saving and pausing game...
[19:37:48] [Server thread/INFO]: Saving chunks for level 'Mekcraftia'/Overworld
[19:37:48] [Server thread/INFO]: Saving chunks for level 'Mekcraftia'/Nether
[19:37:48] [Server thread/INFO]: Saving chunks for level 'Mekcraftia'/The End
[19:37:48] [Server thread/INFO]: Saving chunks for level 'Mekcraftia'/Moon
[19:37:48] [Server thread/INFO]: Saving chunks for level 'Mekcraftia'/Mars
[19:37:48] [Server thread/INFO]: Saving chunks for level 'Mekcraftia'/Asteroids
[19:37:48] [Server thread/INFO]: Saving chunks for level 'Mekcraftia'/Venus
[19:37:50] [Server thread/INFO]: Stopping server
[19:37:50] [Server thread/INFO]: Saving players
[19:37:50] [Server thread/INFO]: m00b13n lost connection: TextComponent{text='Disconnected', siblings=[], style=Style{hasParent=false, color=null, bold=null, italic=null, underlined=null, obfuscated=null, clickEvent=null, hoverEvent=null, insertion=null}}
[19:37:50] [Server thread/INFO]: m00b13n left the game
[19:37:50] [Server thread/INFO]: Stopping singleplayer server as player logged out
[19:37:50] [Server thread/INFO]: Saving worlds
[19:37:50] [Server thread/INFO]: Saving chunks for level 'Mekcraftia'/Overworld
[19:37:50] [Server thread/INFO]: Saving chunks for level 'Mekcraftia'/Nether
[19:37:50] [Server thread/INFO]: Saving chunks for level 'Mekcraftia'/The End
[19:37:50] [Server thread/INFO]: Saving chunks for level 'Mekcraftia'/Moon
[19:37:50] [Server thread/INFO]: Saving chunks for level 'Mekcraftia'/Mars
[19:37:50] [Server thread/INFO]: Saving chunks for level 'Mekcraftia'/Asteroids
[19:37:50] [Server thread/INFO]: Saving chunks for level 'Mekcraftia'/Venus