Minecraft Error Log

[09:34:44] [Server thread/INFO]: Starting minecraft server version 1.7.10
[09:35:34] [Server thread/INFO]: Loading properties
[09:35:34] [Server thread/INFO]: Default game type: SURVIVAL
[09:35:34] [Server thread/INFO]: Generating keypair
[09:35:34] [Server thread/INFO]: Starting Minecraft server on 217.114.193.120:25565
[09:36:03] [Server thread/INFO]: Preparing level "world"
[09:36:05] [Server thread/INFO]: Preparing start region for level 0
[09:36:05] [Server thread/WARN]: Skipping Piece with id Vrftools
[09:36:05] [Server thread/WARN]: Skipping BlockEntity with id SequencerTileEntity
[09:36:05] [Server thread/WARN]: Skipping BlockEntity with id SequencerTileEntity
[09:36:06] [Server thread/INFO]: Preparing spawn area: 56%
[09:36:06] [Server thread/INFO]: Done (3.671s)! For help, type "help" or "?"
[09:36:06] [Server thread/INFO]: Starting GS4 status listener
[09:36:06] [Query Listener #1/INFO]: Query running on 217.114.193.120:25565
[09:36:08] [Server thread/ERROR]: Encountered an unexpected exception
java.lang.NoSuchMethodError: java.util.concurrent.ConcurrentHashMap.keySet()Ljava/util/concurrent/ConcurrentHashMap$KeySetView;
	at blusunrize.immersiveengineering.common.EventHandler.onWorldTick(EventHandler.java:259) ~[EventHandler.class:?]
	at cpw.mods.fml.common.eventhandler.ASMEventHandler_664_EventHandler_onWorldTick_WorldTickEvent.invoke(.dynamic) ~[?:?]
	at cpw.mods.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:54) ~[ASMEventHandler.class:?]
	at cpw.mods.fml.common.eventhandler.EventBus.post(EventBus.java:140) ~[EventBus.class:?]
	at cpw.mods.fml.common.FMLCommonHandler.onPostWorldTick(FMLCommonHandler.java:255) ~[FMLCommonHandler.class:?]
	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:645) ~[MinecraftServer.class:?]
	at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:334) ~[lt.class:?]
	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:547) ~[MinecraftServer.class:?]
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:427) [MinecraftServer.class:?]
	at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685) [li.class:?]
[09:36:08] [Server thread/ERROR]: This crash report has been saved to: /games/ni300683_1/ftproot/minecraftftb/./crash-reports/crash-2016-03-14_09.36.08-server.txt
[09:36:08] [Server thread/INFO]: Stopping server
[09:36:08] [Server thread/INFO]: Saving players
[09:36:08] [Server thread/INFO]: Saving worlds
[09:36:08] [Server thread/INFO]: Saving chunks for level 'world'/Overworld
[09:36:08] [Server thread/INFO]: Saving chunks for level 'world'/Nether
[09:36:08] [Server thread/INFO]: Saving chunks for level 'world'/The End
[09:36:08] [Server thread/INFO]: Saving chunks for level 'world'/Twilight Forest
[09:36:08] [Server thread/INFO]: Saving chunks for level 'world'/Underdark
[09:36:08] [Server thread/INFO]: Saving chunks for level 'world'/Dungeon
[09:36:08] [Server thread/INFO]: Saving chunks for level 'world'/Spirit World
[09:36:08] [Server thread/INFO]: Saving chunks for level 'world'/Torment
[09:36:08] [Server thread/INFO]: Saving chunks for level 'world'/Mirror
[09:36:08] [Server thread/INFO]: Saving chunks for level 'world'/Bedrock
[09:36:08] [Server thread/INFO]: Saving chunks for level 'world'/The Outer Lands
[09:36:08] [Server thread/INFO]: Saving chunks for level 'world'/The Last Millenium