Miért crash-el a minecraftom?

Ezt írja ki:

---- Minecraft Crash Report ----

// This doesn't make any sense!

Time: 2014.06.12. 14:31

Description: Ticking memory connection

java.lang.IllegalArgumentException: n must be positive

at java.util.Random.nextInt(Unknown Source)

at agm.a(SourceFile:122)

at agm.a(SourceFile:27)

at agg.a(SourceFile:362)

at ahb.a(SourceFile:74)

at apl.a(SourceFile:432)

at mi.a(SourceFile:160)

at aoj.a(SourceFile:781)

at mi.c(SourceFile:95)

at mh.<init>(PlayerManager.java:462)

at mg.getOrCreateChunkWatcher(PlayerManager.java:210)

at mg.a(PlayerManager.java:200)

at mg.a(PlayerManager.java:247)

at ld.a(SourceFile:155)

at ld.c(SourceFile:206)

at ld.a(SourceFile:100)

at nd.c(SourceFile:87)

at nd.a(SourceFile:52)

at ef.a(SourceFile:166)

at ms.c(SourceFile:134)

at net.minecraft.server.MinecraftServer.u(SourceFile:529)

at net.minecraft.server.MinecraftServer.t(SourceFile:441)

at bsk.t(IntegratedServer.java:186)

at net.minecraft.server.MinecraftServer.run(SourceFile:358)

at ky.run(SourceFile:617)

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

---------------------------------------------------------------------------------------

-- Head --

Stacktrace:

at java.util.Random.nextInt(Unknown Source)

at agm.a(SourceFile:122)

at agm.a(SourceFile:27)

at agg.a(SourceFile:362)

at ahb.a(SourceFile:74)

at apl.a(SourceFile:432)

at mi.a(SourceFile:160)

at aoj.a(SourceFile:781)

at mi.c(SourceFile:95)

at mh.<init>(PlayerManager.java:462)

at mg.getOrCreateChunkWatcher(PlayerManager.java:210)

at mg.a(PlayerManager.java:200)

at mg.a(PlayerManager.java:247)

at ld.a(SourceFile:155)

at ld.c(SourceFile:206)

at ld.a(SourceFile:100)

at nd.c(SourceFile:87)

at nd.a(SourceFile:52)

at ef.a(SourceFile:166)

-- Ticking connection --

Details:

Connection: ef@1a084d7

Stacktrace:

at ms.c(SourceFile:134)

at net.minecraft.server.MinecraftServer.u(SourceFile:529)

at net.minecraft.server.MinecraftServer.t(SourceFile:441)

at bsk.t(IntegratedServer.java:186)

at net.minecraft.server.MinecraftServer.run(SourceFile:358)

at ky.run(SourceFile:617)

Bármilyen világot meg próbálok nyitni akkor ezt írja ki.