Server error and crash (1.7.10)

[21:23:54] [server thread/ERROR] [FML/]: Exception caught during firing event cpw.mods.fml.common.gameevent.TickEvent$ServerTickEvent@d4aaa1d:
net.minecraft.util.ReportedException: Ticking GridNode
at appeng.me.cache.TickManagerCache.onUpdateTick(TickManagerCache.java:107) ~[TickManagerCache.class:?]
at appeng.me.GridCacheWrapper.onUpdateTick(GridCacheWrapper.java:22) ~[GridCacheWrapper.class:?]
at appeng.me.Grid.update(Grid.java:207) ~[Grid.class:?]
at appeng.hooks.TickHandler.onTick(TickHandler.java:244) ~[TickHandler.class:?]
at cpw.mods.fml.common.eventhandler.ASMEventHandler_133_TickHandler_onTick_TickEvent.invoke(.dynamic) ~[?:?]
at cpw.mods.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:54) ~[ASMEventHandler.class:git-Cauldron-MCPC-Plus-1.7.10-1.1240.06.213]
at cpw.mods.fml.common.eventhandler.EventBus.post(EventBus.java:138) [EventBus.class:git-Cauldron-MCPC-Plus-1.7.10-1.1240.06.213]
at cpw.mods.fml.common.FMLCommonHandler.onPostServerTick(FMLCommonHandler.java:252) [FMLCommonHandler.class:git-Cauldron-MCPC-Plus-1.7.10-1.1240.06.213]
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:851) [MinecraftServer.class:?]
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:658) [MinecraftServer.class:?]
at java.lang.Thread.run(Thread.java:744) [?:1.7.0_51]
Caused by: java.util.ConcurrentModificationException
at java.util.TreeMap$AbstractMapIterator.makeNext(TreeMap.java:200) ~[?:1.7.0_51]
at java.util.TreeMap$UnboundedValueIterator.next(TreeMap.java:287) ~[?:1.7.0_51]
at appeng.util.item.MeanfulIterator.hasNext(MeanfulIterator.java:22) ~[MeanfulIterator.class:?]
at appeng.crafting.MECraftingInventory.<init>(MECraftingInventory.java:92) ~[MECraftingInventory.class:?]
at appeng.crafting.CraftingJob.<init>(CraftingJob.java:80) ~[CraftingJob.class:?]
at appeng.me.cache.CraftingGridCache.beginCraftingJob(CraftingGridCache.java:548) ~[CraftingGridCache.class:?]
at appeng.helpers.MultiCraftingTracker.handleCrafting(MultiCraftingTracker.java:102) ~[MultiCraftingTracker.class:?]
at appeng.helpers.DualityInterface.handleCrafting(DualityInterface.java:494) ~[DualityInterface.class:?]
at appeng.helpers.DualityInterface.usePlan(DualityInterface.java:441) ~[DualityInterface.class:?]
at appeng.helpers.DualityInterface.updateStorage(DualityInterface.java:605) ~[DualityInterface.class:?]
at appeng.helpers.DualityInterface.tickingRequest(DualityInterface.java:637) ~[DualityInterface.class:?]
at appeng.parts.misc.PartInterface.tickingRequest(PartInterface.java:206) ~[PartInterface.class:?]
at appeng.me.cache.TickManagerCache.onUpdateTick(TickManagerCache.java:70) ~[TickManagerCache.class:?]
... 10 more
[21:23:54] [server thread/ERROR] [FML/]: Index: 8 Listeners:
[21:23:54] [server thread/ERROR] [FML/]: 0: NORMAL
[21:23:54] [server thread/ERROR] [FML/]: 1: ASM: com.flansmod.common.CommonTickHandler@15d9e914 tick(Lcpw/mods/fml/common/gameevent/TickEvent$ServerTickEvent;)V
[21:23:54] [server thread/ERROR] [FML/]: 2: ASM: ic2.core.TickHandler@514afa7b onServerTick(Lcpw/mods/fml/common/gameevent/TickEvent$ServerTickEvent;)V
[21:23:54] [server thread/ERROR] [FML/]: 3: ASM: hats.common.core.TickHandlerServer@46cad25d serverTick(Lcpw/mods/fml/common/gameevent/TickEvent$ServerTickEvent;)V
[21:23:54] [server thread/ERROR] [FML/]: 4: ASM: GridTickHandler[Energy]@1862528025 tick(Lcpw/mods/fml/common/gameevent/TickEvent$ServerTickEvent;)V
[21:23:54] [server thread/ERROR] [FML/]: 5: ASM: GridTickHandler[Redstone]@268112948 tick(Lcpw/mods/fml/common/gameevent/TickEvent$ServerTickEvent;)V
[21:23:54] [server thread/ERROR] [FML/]: 6: ASM: GridTickHandler[Fluid]@327413404 tick(Lcpw/mods/fml/common/gameevent/TickEvent$ServerTickEvent;)V
[21:23:54] [server thread/ERROR] [FML/]: 7: ASM: codechicken.multipart.handler.MultipartEventHandler$@1f14ec87 serverTick(Lcpw/mods/fml/common/gameevent/TickEvent$ServerTickEvent;)V
[21:23:54] [server thread/ERROR] [FML/]: 8: ASM: appeng.hooks.TickHandler@5b20ccbe onTick(Lcpw/mods/fml/common/gameevent/TickEvent;)V