java.lang.IllegalStateException: Failed to add player. mp['hrq0123456789aa'/224, l='Novo Mundo', x=-39,17, y=67,42, z=258,57] already is in chunk -6, 13
	at mk.a(SourceFile:37)
	at mj.d(SourceFile:346)
	at lg.d(SourceFile:215)
	at na.a(SourceFile:280)
	at iu.a(SourceFile:137)
	at iw.a(SourceFile:20)
	at ef.a(SourceFile:164)

---- Minecraft Crash Report ----
// Don't do that.

Time: 06/12/13 12:24
Description: Ticking memory connection

java.lang.IllegalStateException: Failed to add player. mp['hrq0123456789aa'/224, l='Novo Mundo', x=-39,17, y=67,42, z=258,57] already is in chunk -6, 13
	at mk.a(SourceFile:37)
	at mj.d(SourceFile:346)
	at lg.d(SourceFile:215)
	at na.a(SourceFile:280)
	at iu.a(SourceFile:137)
	at iw.a(SourceFile:20)
	at ef.a(SourceFile:164)
	at mv.c(SourceFile:134)
	at net.minecraft.server.MinecraftServer.u(SourceFile:528)
	at net.minecraft.server.MinecraftServer.t(SourceFile:440)
	at btk.t(SourceFile:117)
	at net.minecraft.server.MinecraftServer.run(SourceFile:357)
	at lb.run(SourceFile:616)


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Stacktrace:
	at mk.a(SourceFile:37)
	at mj.d(SourceFile:346)
	at lg.d(SourceFile:215)
	at na.a(SourceFile:280)
	at iu.a(SourceFile:137)
	at iw.a(SourceFile:20)
	at ef.a(SourceFile:164)

-- Ticking connection --
Details:
	Connection: ef@1bf4bc8
Stacktrace:
	at mv.c(SourceFile:134)
	at net.minecraft.server.MinecraftServer.u(SourceFile:528)
	at net.minecraft.server.MinecraftServer.t(SourceFile:440)
	at btk.t(SourceFile:117)
	at net.minecraft.server.MinecraftServer.run(SourceFile:357)
	at lb.run(SourceFile:616)

-- System Details --
Details:
	Minecraft Version: 1.7.3
	Operating System: Windows 8 (x86) version 6.2
	Java Version: 1.7.0_45, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
	Memory: 64231568 bytes (61 MB) / 237518848 bytes (226 MB) up to 518979584 bytes (494 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
	AABB Pool Size: 7122 (398832 bytes; 0 MB) allocated, 2987 (167272 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 1944 (108864 bytes; 0 MB) allocated, 1479 (82824 bytes; 0 MB) used
	Player Count: 1 / 8; [mp['hrq0123456789aa'/224, l='Novo Mundo', x=-39,17, y=67,42, z=258,57]]
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.