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---- Minecraft Crash Report ----
// Don't be sad, have a hug! <3
Time: 07/04/13 20:41
Description: Ticking memory connection
java.lang.IllegalStateException: Failed to add player. jc['curambar'/4293, l='Copy of Snorlax Land', x=-248,00, y=64,00, z=256,00] already is in chunk -8, 20
at ix.a(SourceFile:31)
at iw.d(SourceFile:300)
at gu.d(SourceFile:194)
at jh.a(SourceFile:278)
at ee.a(SourceFile:136)
at ch.b(SourceFile:59)
at jh.d(SourceFile:60)
at jk.b(SourceFile:35)
at bjk.b(SourceFile:84)
at net.minecraft.server.MinecraftServer.r(SourceFile:480)
at net.minecraft.server.MinecraftServer.q(SourceFile:397)
at bjh.q(SourceFile:122)
at net.minecraft.server.MinecraftServer.run(SourceFile:331)
at gp.run(SourceFile:573)

A detailed walkthrough of the error, its code path and all known details is as follows:
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-- System Details --
Details:
Minecraft Version: 1.5.1
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.7.0_17, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 203349208 bytes (193 MB) / 519110656 bytes (495 MB) up to 1037959168 bytes (989 MB)
JVM Flags: 2 total; -Xms512m -Xmx1024m
AABB Pool Size: 3938 (220528 bytes; 0 MB) allocated, 3110 (174160 bytes; 0 MB) used
Suspicious classes: $Proxy1, $Proxy2, $Proxy3, ...[com.sijobe.installer.ActionHandler, FooterLink, GuiMain$1, ...], [com.sijobe.spc.command.StandardCommand, Achievement, Ascend, ...], [com.sijobe.spc.core.HookManager, IHook, IPlayerMP, ...], [com.sijobe.spc.hooks.CheckUpdates, InitialiseCommands, TestPlayerMP], [com.sijobe.spc.overwrite.ONetServerHandler], [com.sijobe.spc.updater.UpdateCallback, CheckVersion, ModVersion], [com.sijobe.spc.util.DynamicClassLoader, KeyListener, CommandBlockHelper, ...], [com.sijobe.spc.validation.Parameter, ParameterBoolean, ParameterDouble, ...], [com.sijobe.spc.worldedit.LocalPlayer, LocalWorld, MinecraftBiomeType, ...], [com.sijobe.spc.wrapper.Player, Minecraft, CommandBase, ...], [com.sijobe.swing.JHyperLink], [com.sk89q.minecraft.util.commands.CommandsManager, Injector, CommandException, ...], [com.sk89q.util.StringUtil], [com.sk89q.worldedit.LocalPlayer, LocalWorld, BiomeType, ...], [com.sk89q.worldedit.bags.BlockBagException, UnplaceableBlockException], [com.sk89q.worldedit.blocks.TileEntityBlock, BaseBlock, SignBlock, ...], [com.sk89q.worldedit.commands.InsufficientArgumentsException, BiomeCommands, ChunkCommands, ...], [com.sk89q.worldedit.cui.CUIEvent, CUIRegion, SelectionPointEvent], [com.sk89q.worldedit.data.DataException, ChunkStoreException, MissingWorldException], [com.sk89q.worldedit.expression.ExpressionException], [com.sk89q.worldedit.filtering.GaussianKernel], [com.sk89q.worldedit.foundation.World, NbtValued, Block], [com.sk89q.worldedit.masks.Mask], [com.sk89q.worldedit.patterns.Pattern, SingleBlockPattern], [com.sk89q.worldedit.regions.RegionSelector, RegionOperationException, CuboidRegionSelector, ...], [com.sk89q.worldedit.scripting.CraftScriptEngine], [com.sk89q.worldedit.snapshots.InvalidSnapshotException], [com.sk89q.worldedit.tools.Tool, BlockTool, SinglePickaxe], [com.sk89q.worldedit.tools.brushes.Brush], [com.sk89q.worldedit.util.PropertiesConfiguration, TargetBlock]
IntCache: cache: 0, tcache: 0, allocated: 1, tallocated: 63
Profiler Position: N/A (disabled)
Vec3 Pool Size: 1023 (57288 bytes; 0 MB) allocated, 488 (27328 bytes; 0 MB) used
Player Count: 1 / 8; [jc['curambar'/4293, l='Copy of Snorlax Land', x=-248,00, y=64,00, z=256,00]]
Type: Integrated Server (map_client.txt)
Is Modded: Very likely; Jar signature invalidated