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So I have a modded server. It worked for about an hour or two, then I get an Internal server error. What do I do to fix it. Thanks to anyone that helps. I play on 1.7.10.


[21:34:34] [User Authenticator #15/INFO]: UUID of player sliced_raspberry is 8de02905-b299-4129-ae64-1af2ec6df68b
[21:34:35] [Server thread/INFO]: sliced_raspberry[/myIp:53151] logged in with entity id 13958 at (74.5387668477194, 12.0, -126.68285550963652)
[21:34:35] [Server thread/INFO]: sliced_raspberry joined the game
[21:34:36] [Server thread/WARN]: Failed to handle packet for /MyIp:53151
net.minecraft.util.ReportedException: Ticking player
at net.minecraft.entity.player.EntityPlayerMP.func_71127_g(EntityPlayerMP.java:349) ~[mw.class:?]
at net.minecraft.network.NetHandlerPlayServer.func_147347_a(NetHandlerPlayServer.java:303) ~[nh.class:?]
at net.minecraft.network.play.client.C03PacketPlayer.func_148833_a(SourceFile:137) ~[jd.class:?]
at net.minecraft.network.play.client.C03PacketPlayer$C06PacketPlayerPosLook.func_148833_a(SourceFile:20) ~[jf.class:?]
at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:212) ~[ej.class:?]
at net.minecraft.network.NetworkSystem.func_151269_c(NetworkSystem.java:165) [nc.class:?]
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:659) [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:?]
Caused by: java.lang.NoClassDefFoundError: am2/lore/ArcaneCompendium
at am2.lore.CompendiumUnlockHandler.onPlayerPickupItem(CompendiumUnlockHandler.java:73) ~[CompendiumUnlockHandler.class:?]
at cpw.mods.fml.common.eventhandler.ASMEventHandler_871_CompendiumUnlockHandler_onPlayerPickupItem_EntityItemPickupEvent.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:138) ~[EventBus.class:?]
at net.minecraft.entity.item.EntityItem.func_70100_b_(EntityItem.java:345) ~[xk.class:?]
at net.minecraft.entity.player.EntityPlayer.func_71044_o(EntityPlayer.java:609) ~[yz.class:?]
at net.minecraft.entity.player.EntityPlayer.func_70636_d(EntityPlayer.java:600) ~[yz.class:?]
at net.minecraft.entity.EntityLivingBase.func_70071_h_(EntityLivingBase.java:1611) ~[sv.class:?]
at net.minecraft.entity.player.EntityPlayer.func_70071_h_(EntityPlayer.java:288) ~[yz.class:?]
at net.minecraft.entity.player.EntityPlayerMP.func_71127_g(EntityPlayerMP.java:295) ~[mw.class:?]
... 10 more
[21:34:37] [Server thread/INFO]: sliced_raspberry lost connection: TextComponent{text='Internal server error', siblings=[], style=Style{hasParent=false, color=null, bold=null, italic=null, underlined=null, obfuscated=null, clickEvent=null, hoverEvent=null}}
[21:34:37] [Server thread/INFO]: sliced_raspberry left the game

Where it says "MyIp" I put it there so no one tries to log on to my server.

If I disable Ars Magica 2, will it prevent the problem?
Yes I'm using Optifine 1.7.10_Hd_U_B5

How do I reconfigure the IDs???