2013-12-13 09:45:10 [SEVERE] java.lang.IllegalArgumentException
2013-12-13 09:45:10 [SEVERE] 	at com.xcompwiz.mystcraft.utility.WeightedItemSelector.getRandomItem(WeightedItemSelector.java:33)
2013-12-13 09:45:10 [SEVERE] 	at com.xcompwiz.mystcraft.utility.WeightedItemSelector.getRandomItem(WeightedItemSelector.java:28)
2013-12-13 09:45:10 [SEVERE] 	at com.xcompwiz.mystcraft.symbols.SymbolManager.findAgeSymbolImplementing(SymbolManager.java:129)
2013-12-13 09:45:10 [SEVERE] 	at com.xcompwiz.mystcraft.world.AgeController.reconstruct(AgeController.java:176)
2013-12-13 09:45:10 [SEVERE] 	at com.xcompwiz.mystcraft.world.AgeController.<init>(AgeController.java:110)
2013-12-13 09:45:10 [SEVERE] 	at com.xcompwiz.mystcraft.world.WorldProviderMyst.func_76572_b(WorldProviderMyst.java:66)
2013-12-13 09:45:10 [SEVERE] 	at net.minecraft.world.WorldProvider.func_76558_a(WorldProvider.java:63)
2013-12-13 09:45:10 [SEVERE] 	at net.minecraft.world.World.<init>(World.java:453)
2013-12-13 09:45:10 [SEVERE] 	at net.minecraft.world.WorldServer.<init>(WorldServer.java:197)
2013-12-13 09:45:10 [SEVERE] 	at net.minecraft.world.WorldServerMulti.<init>(WorldServerMulti.java:14)
2013-12-13 09:45:10 [SEVERE] 	at net.minecraftforge.common.DimensionManager.initDimension(DimensionManager.java:341)
2013-12-13 09:45:10 [SEVERE] 	at net.minecraft.server.MinecraftServer.func_71218_a(MinecraftServer.java:993)
2013-12-13 09:45:10 [SEVERE] 	at com.xcompwiz.mystcraft.linking.LinkController.travelEntity(LinkController.java:45)
2013-12-13 09:45:10 [SEVERE] 	at com.xcompwiz.mystcraft.item.ItemLinking.activate(ItemLinking.java:81)
2013-12-13 09:45:10 [SEVERE] 	at com.xcompwiz.mystcraft.inventory.ContainerBook.processMessage(ContainerBook.java:286)
2013-12-13 09:45:10 [SEVERE] 	at com.xcompwiz.mystcraft.network.MPacketGUIMessage.handle(MPacketGUIMessage.java:36)
2013-12-13 09:45:10 [SEVERE] 	at com.xcompwiz.mystcraft.network.MystcraftPacketHandler.onPacketData(MystcraftPacketHandler.java:45)
2013-12-13 09:45:10 [SEVERE] 	at cpw.mods.fml.common.network.NetworkRegistry.handlePacket(NetworkRegistry.java:270)
2013-12-13 09:45:10 [SEVERE] 	at cpw.mods.fml.common.network.NetworkRegistry.handleCustomPacket(NetworkRegistry.java:259)
2013-12-13 09:45:10 [SEVERE] 	at cpw.mods.fml.common.network.FMLNetworkHandler.handlePacket250Packet(FMLNetworkHandler.java:85)
2013-12-13 09:45:10 [SEVERE] 	at net.minecraft.network.NetServerHandler.func_72501_a(NetServerHandler.java:2447)
2013-12-13 09:45:10 [SEVERE] 	at net.minecraft.network.packet.Packet250CustomPayload.func_73279_a(Packet250CustomPayload.java:70)
2013-12-13 09:45:10 [SEVERE] 	at net.minecraft.network.TcpConnection.func_74428_b(TcpConnection.java:470)
2013-12-13 09:45:10 [SEVERE] 	at net.minecraft.network.NetServerHandler.func_72570_d(NetServerHandler.java:233)
2013-12-13 09:45:10 [SEVERE] 	at net.minecraft.network.NetworkListenThread.func_71747_b(NetworkListenThread.java:54)
2013-12-13 09:45:10 [SEVERE] 	at net.minecraft.server.dedicated.DedicatedServerListenThread.func_71747_b(DedicatedServerListenThread.java:34)
2013-12-13 09:45:10 [SEVERE] 	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:926)
2013-12-13 09:45:10 [SEVERE] 	at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:330)
2013-12-13 09:45:10 [SEVERE] 	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:793)
2013-12-13 09:45:10 [SEVERE] 	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:675)
2013-12-13 09:45:10 [SEVERE] 	at net.minecraft.server.ThreadMinecraftServer.run(ThreadMinecraftServer.java:16)