Hopper: dk: Error while parsing: TranslatableComponent{key='multiplayer.player.joined', args=[Khaledalhassan], siblings=[], style=Style{hasParent=false, color

dk: Error while parsing: TranslatableComponent{key='multiplayer.player.joined', args=[Khaledalhassan], siblings=[], style=Style{hasParent=false, color=§e, bold=null, italic=null, underlined=null, obfuscated=null}}
	at dj.e(SourceFile:79)
	at dj.c(SourceFile:125)
	at net.minecraft.server.MinecraftServer.a(SourceFile:736)
	at hw.a(SourceFile:747)
	at hw.a(SourceFile:752)
	at hw.a(SourceFile:94)
	at bnq.b(SourceFile:73)
	at net.minecraft.server.MinecraftServer.t(SourceFile:481)
	at net.minecraft.server.MinecraftServer.s(SourceFile:398)
	at bnn.s(SourceFile:124)
	at net.minecraft.server.MinecraftServer.run(SourceFile:332)
	at hr.run(SourceFile:575)
Caused by: java.util.FormatFlagsConversionMismatchException: Conversion = s, Flags =  
	at java.util.Formatter$FormatSpecifier.failMismatch(Formatter.java:3995)
	at java.util.Formatter$FormatSpecifier.checkBadFlags(Formatter.java:2905)
	at java.util.Formatter$FormatSpecifier.checkGeneral(Formatter.java:2863)
	at java.util.Formatter$FormatSpecifier.<init>(Formatter.java:2639)
	at java.util.Formatter.parse(Formatter.java:2480)
	at java.util.Formatter.format(Formatter.java:2414)
	at java.util.Formatter.format(Formatter.java:2367)
	at java.lang.String.format(String.java:2769)
	at dj.e(SourceFile:76)
	... 11 more

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

Time: 9/6/13 9:59 PM
Description: Exception in server tick loop

dk: Error while parsing: TranslatableComponent{key='multiplayer.player.joined', args=[Khaledalhassan], siblings=[], style=Style{hasParent=false, color=§e, bold=null, italic=null, underlined=null, obfuscated=null}}
	at dj.e(SourceFile:79)
	at dj.c(SourceFile:125)
	at net.minecraft.server.MinecraftServer.a(SourceFile:736)
	at hw.a(SourceFile:747)
	at hw.a(SourceFile:752)
	at hw.a(SourceFile:94)
	at bnq.b(SourceFile:73)
	at net.minecraft.server.MinecraftServer.t(SourceFile:481)
	at net.minecraft.server.MinecraftServer.s(SourceFile:398)
	at bnn.s(SourceFile:124)
	at net.minecraft.server.MinecraftServer.run(SourceFile:332)
	at hr.run(SourceFile:575)
Caused by: java.util.FormatFlagsConversionMismatchException: Conversion = s, Flags =  
	at java.util.Formatter$FormatSpecifier.failMismatch(Formatter.java:3995)
	at java.util.Formatter$FormatSpecifier.checkBadFlags(Formatter.java:2905)
	at java.util.Formatter$FormatSpecifier.checkGeneral(Formatter.java:2863)
	at java.util.Formatter$FormatSpecifier.<init>(Formatter.java:2639)
	at java.util.Formatter.parse(Formatter.java:2480)
	at java.util.Formatter.format(Formatter.java:2414)
	at java.util.Formatter.format(Formatter.java:2367)
	at java.lang.String.format(String.java:2769)
	at dj.e(SourceFile:76)
	... 11 more


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

-- System Details --
Details:
	Minecraft Version: 13w36b
	Operating System: Mac OS X (x86_64) version 10.6.8
	Java Version: 1.6.0_45, Apple Inc.
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
	Memory: 13583104 bytes (12 MB) / 124268544 bytes (118 MB) up to 1069416448 bytes (1019 MB)
	JVM Flags: 1 total; -Xmx1G
	AABB Pool Size: 2551 (142856 bytes; 0 MB) allocated, 2551 (142856 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 353 (19768 bytes; 0 MB) allocated, 352 (19712 bytes; 0 MB) used
	Player Count: 0 / 8; []
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.